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    No ‘Hippie Ape’: Bonobos Are Often Aggressive, Study Finds

    Despite their peaceful reputation, bonobos act aggressively more often than their chimpanzee cousins, a new study found.In the early 1900s, primatologists noticed a group of apes in central Africa with a distinctly slender build; they called them “pygmy chimpanzees.” But as the years passed, it became clear that those animals, now known as bonobos, were profoundly different from chimpanzees.Chimpanzee societies are dominated by males that kill other males, raid the territory of neighboring troops and defend their own ground with border patrols. Male chimpanzees also attack females to coerce them into mating, and sometimes even kill infants. Among bonobos, in contrast, females are dominant. Males do not go on patrols, form alliances or kill other bonobos. And bonobos usually resolve their disputes with sex — lots of it.Bonobos became famous for showing that nature didn’t always have to be red in tooth and claw. “Bonobos are an icon for peace and love, the world’s ‘hippie chimps,’” Sally Coxe, a conservationist, said in 2006.But these sweeping claims were not based on much data. Because bonobos live in remote, swampy rainforests, it has been much more difficult to observe them in the wild than chimpanzees. More recent research has shown that bonobos live a more aggressive life than their reputation would suggest.In a study based on thousands of hours of observations in the wild published on Friday, for example, researchers found that male bonobos commit acts of aggression nearly three times as often as male chimpanzees do.“There is no ‘hippie ape,’” said Maud Mouginot, a biological anthropologist at Boston University who led the analysis.We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More

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    It’s a Golden Age for Shipwreck Discoveries. Why?

    More lost shipwrecks are being found because of new technology, climate change and more vessels scanning the ocean floor for science or commerce.Some were fabled vessels that have fascinated people for generations, like Endurance, Ernest Shackleton’s ship that sank in the Antarctic in 1915. Some were common workhorses that faded into the depths, like the Ironton, a barge that was carrying 1,000 tons of grain when it sank in Lake Huron in 1894.No matter their place in history, more shipwrecks are being found these days than ever before, according to those who work in the rarefied world of deep-sea exploration.“More are being found, and I also think more people are paying attention,” said James P. Delgado, an underwater archaeologist based in Washington, D.C. He added: “We’re in a transitional phase where the true period of deep-sea and ocean exploration in general is truly beginning.”So what’s behind the increase?Experts point to a number of factors. Technology, they say, has made it easier and less expensive to scan the ocean floor, opening up the hunt to amateurs and professionals alike. More people are surveying the ocean for research and commercial ventures. Shipwreck hunters are also looking for wrecks for their historical value, rather than for sunken treasure. And climate change has intensified storms and beach erosion, exposing shipwrecks in shallow water.Underwater robots and new imaging are helping.Experts agreed that new technology has revolutionized deep-sea exploration.Free-swimming robots, known as autonomous underwater vehicles, are much more commonplace than they were 20 years ago, and can scan large tracts of the ocean floor without having to be tethered to a research vessel, according to J. Carl Hartsfield, the director and senior program manager of the Oceanographic Systems Laboratory at the Woods Hole Oceanographic Institution in Massachusetts.Remotely operated vehicles can travel 25 miles under the ice sheet in polar regions, he said. And satellite imagery can detect shipwrecks from plumes of sediment moving around them that are visible from space.We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More

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    This Was Village Life in Britain 3,000 Years Ago

    Three millenniums ago, a small, prosperous farming community briefly flourished in the freshwater marshes of eastern England. The inhabitants lived in a clutch of thatched roundhouses built on wooden stilts above a channel of the River Nene, which empties into the North Sea. They wore clothes of fine flax linen, with pleats and tasseled hems; bartered for glass and amber beads imported from places as far-flung as present-day Iran; drank from delicate clay poppyhead cups; dined on leg of boar and honey-glazed venison, and fed table scraps to their dogs.Within a year of its construction, this prehistoric idyll met a dramatic end. A catastrophic fire tore through the compound; the buildings collapsed and the villagers fled, abandoning their garments, tools and weapons. Everything, including the porridge left in cooking pots, crashed through the burning wicker floors into the thick, sticky reed beds below and stayed there. Eventually, the objects sank, hidden and entombed, in more than six feet of oozing peat and silt. The river gradually moved course away from the encampment, but the debris remained intact for nearly 3,000 years, preserving a record of daily life at the end of Britain’s Bronze Age, from 2500 B.C. to 800 B.C.That frozen moment in time is the subject of two monographs published Tuesday by Cambridge University. Based on a 10-month excavation of what is now known as Must Farm Quarry, a submerged and superbly preserved settlement in the shadow of a potato-chip factory 75 miles north of London, the studies are as detailed as a forensic investigation report of a crime scene. One paper, a site synthesis, runs to 323 pages; the other, for specialists, is nearly 1,000 pages longer.“This didn’t feel like archaeology,” said Mark Knight, the project director and one of the paper’s authors. “At times, excavating the site felt slightly rude and intrusive, as if we had turned up after a tragedy, picked through someone’s possessions and got a glimpse of what they did one day in 850 B.C.”The sharpened tip of a post; an amber bead; an axehead in situ.Cambridge Archaeological UnitEvidence for life in Britain’s Bronze Age has traditionally come from fortified and religious sites that are often found on high, dry landscapes. Most of the clues come as pottery, flint tools and bones. “Generally we have to work with small bits and pieces and barely visible remains of houses, and read between the lines,” said Harry Fokkens, an archaeologist at Leiden University. Convincing anyone that such places were once thriving settlements takes a little imagination.We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More

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    Mighty Shiva Was Never Meant to Live in Manhattan

    “What if museums give back so much art that they have nothing left to display?” As a scholar of the debates about returning cultural objects to the countries from which they were stolen, I have, over the years, heard many variations of that question. “Museums have lots and lots of stuff,” I usually answer, fighting the urge to roll my eyes. “It’s not like they’re just going to shut down.”But in December, the Metropolitan Museum of Art announced it would return a substantial proportion of its Khmer-era works to Cambodia, which is claiming still more, including nearly all the museum’s major Cambodian pieces. Last month, the American Museum of Natural History indefinitely closed two of its halls in response to new federal regulations about the display of Native American sacred and burial artifacts. Now Manhattan’s Rubin Museum of Art, which features art from the Himalayas, has announced that it will close later this year. The museum says the decision is unrelated to issues of cultural repatriation, but it comes after the museum faced many accusations of cultural theft and returned some prized pieces.Clearly, I need to change my answer.When stolen artifacts go back to their rightful owners, it is now clear, some display cases will indeed empty out, some galleries will shut their doors, and entire museums may even close. But it’s worth it. Repatriating these precious items is still the right thing to do, no matter the cost.Why? Museums are supposed to educate us about other ways of being in the world. But looted artifacts alone — removed from their original context, quarantined in an antiseptic display case — cannot do this. Unlike, say, Impressionist paintings or Pop Art sculptures, ritual objects were not meant to be seen in a gallery at a time of the viewer’s choosing. Used alongside music, scents and tastes, these holy relics are tools to help participants in rituals achieve a transcendent experience. Imagine looking at a glow stick necklace and thinking it could teach you what it’s like to greet the sunrise dancing ecstatically with hundreds of strangers.The Rubin Museum, which displays art from Tibet, Nepal and elsewhere in the Himalayan region, returned two stolen objects to Nepal in 2022 and last year surrendered another, a spectacular 16th-century mask depicting one of Shiva’s manifestations. By chance, I heard the news about the Rubin’s closing while I was looking at photographs from the mask’s homecoming ceremony.The mask was one of a nearly identical pair depicting the snarling deity with golden skulls and snakes twining through blood-red hair. For centuries, they had been featured in an annual ceremony, in which worshipers sought blessings by drinking rice beer from the masks’ lips. In the mid 1990s they were both stolen from the home of the family that was entrusted to care for them when the ceremony was not underway.We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More

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    Leading Museums Remove Native Displays Amid New Federal Rules

    The American Museum of Natural History is closing two major halls as museums around the nation respond to updated policies from the Biden administration.The American Museum of Natural History will close two major halls exhibiting Native American objects, its leaders said on Friday, in a dramatic response to new federal regulations that require museums to obtain consent from tribes before displaying or performing research on cultural items.“The halls we are closing are artifacts of an era when museums such as ours did not respect the values, perspectives and indeed shared humanity of Indigenous peoples,” Sean Decatur, the museum’s president, wrote in a letter to the museum’s staff on Friday morning. “Actions that may feel sudden to some may seem long overdue to others.”The museum is closing galleries dedicated to the Eastern Woodlands and the Great Plains this weekend, and covering a number of other display cases featuring Native American cultural items as it goes through its enormous collection to make sure it is in compliance with the new federal rules, which took effect this month.Museums around the country have been covering up displays as curators scramble to determine whether they can be shown under the new regulations. The Field Museum in Chicago covered some display cases, the Peabody Museum of Archaeology and Ethnology at Harvard University said it would remove all funerary belongings from exhibition and the Cleveland Museum of Art has covered up some cases.But the action by the American Museum of Natural History in New York, which draws 4.5 million visitors a year, making it one of the most visited museums in the world, sends a powerful message to the field. The museum’s anthropology department is one of the oldest and most prestigious in the United States, known for doing pioneering work under a long line of curators including Franz Boas and Margaret Mead. The closures will leave nearly 10,000 square feet of exhibition space off-limits to visitors; the museum said it could not provide an exact timeline for when the reconsidered exhibits would reopen.“Some objects may never come back on display as a result of the consultation process,” Decatur said in an interview. “But we are looking to create smaller-scale programs throughout the museum that can explain what kind of process is underway.”We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber?  More

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    Elizabeth Moynihan, Engine of the Senator’s Success, Dies at 94

    She not only had an outsize role in New York and Washington politics as the wife of Daniel Patrick Moynihan; she also made a significant archaeological discovery in India.Elizabeth Moynihan, who was a vital political partner to her husband, Daniel Patrick Moynihan, during his four terms as a U.S. Senator from New York; played a consequential role in Washington herself; and, as an architectural historian, made a signal discovery in India, died on Tuesday at her home in Manhattan. She was 94.Her death was confirmed by her daughter, Maura Moynihan. Reticent in public but spirited, irreverent and combustible in private, Mrs. Moynihan was a formidable political strategist. “I don’t choose to be a public person,” she told The New York Times in 1976. “You know, the more public Pat has become, the more adamantly private I have felt.”But she was Senator Moynihan’s full partner on the legislation and policy they debated with his staff members and other advisers at the couple’s kitchen table in Washington, and she was his surrogate in overseeing his Senate staff and maintaining its loyalty.Mrs. Moynihan managed all four of her husband’s successful, no-frills campaigns, beginning in 1976, when she was photographed here.Chester Higgins, Jr./The New York TimesWhile her role was never publicly acknowledged, Mrs. Moynihan deserved credit for helping to enact what in 1993 was considered the most important legislative issue of Bill Clinton’s presidency: the budget and tax increases that undergirded the White House’s five-year economic program.It was her browbeating of Senator Bob Kerrey, Democrat of Nebraska, that provided what turned out to be the one-vote margin needed to pass the legislation, after her husband and the president, fellow Democrats, had failed to convince him. The bill was viewed at the White House as essential to Mr. Clinton’s ultimate success as president.On the morning of Aug. 6, Senator Kerrey met for an hour with Mr. Clinton but was apparently unpersuaded until Mrs. Moynihan telephoned hours later, around 6 p.m.As Mr. Moynihan later recalled the conversation in a memo, his wife emphatically told Mr. Kerrey, “I want to live to see you president,” but by voting against the bill, she said, “your future as a national Democrat is at risk.” To be sure, it was a bad bill, she said, agreeing with the senator, but her husband “feels we cannot have another president fail.”At 8:30 p.m., Mr. Kerrey, the last to announce which way he would vote, declared on the Senate floor that he would support Mr. Clinton. Vice President Al Gore went on to cast the tiebreaking vote.“She turned him around from a hard no to yes,” Tony Bullock, Mr. Moynihan’s last chief of staff, said of Senator Kerrey.Mr. Kerrey said in an email on Tuesday that while he did not remember the specific conversation, “I know for certain that she would have been disappointed with a ‘no’ vote, and I know for certain it would have been easier to disappoint the president than to disappoint Liz.”Mrs. Moynihan, here with Senator Moynihan, persuaded Senator Bob Kerrey to vote yes on a bill central to President Bill Clinton’s economic agenda. “She turned him around from a hard no to yes,” a former Moynihan aide said.Barry Thumma/Associated PressMrs. Moynihan managed all four of her husband’s successful, no-frills Senate campaigns, beginning in 1976. She called them “mom-and-pop” operations, but they were thoroughly professional.She also bolstered his commitment to improving the architecture of proposed federal public works, the rehabilitation of Pennsylvania Avenue in Washington and historic preservation in New York and elsewhere.“Every night over dinner the Senator told her everything — and I mean everything — that took place in the office that day,” said Richard Eaton, a former chief of staff to the senator. “Many mornings Liz would call me and tell me something that could have been handled better, or about some personnel concern that I was not aware of so that it could be fixed.”Mrs. Moynihan was especially effective in dissuading potential Democratic challengers to her husband’s re-election (like H. Carl McCall, the New York State comptroller) and those from the Republican Party (including Rudolph W. Giuliani, when he was a U.S. attorney), in part by supporting a TV advertising blitz lauding Mr. Moynihan early in the campaign.In the late 1970s, when her husband was the ambassador to India, Mrs. Moynihan developed an interest in Babur, the emperor who founded the Mughal dynasty almost 500 years ago.Analyzing a 1921 translation of Babur’s journal, she became convinced that the elegant pleasure garden he built 150 miles south of New Delhi still existed, even though most scholars believed it had probably vanished. She unearthed the garden in 1978 in what The Times called “an important archaeological discovery.”Babur’s garden became an integral part of her book, “Paradise as a Garden: In Persia and Mughal India” (1979). She also edited the volume “The Moonlight Garden: New Discoveries at the Taj Mahal” (2000), which documented a study of the Mehtab Bagh, a forgotten garden near the Taj Mahal. She led an American team that collaborated with Indian scholars on the project, work that spurred the garden’s restoration and that provided a new and spectacular view of the Taj Mahal.Mrs. Moynihan continued to support the preservation of ancient sites as a founding trustee of the Leon Levy Foundation in New York.Elizabeth Therese Brennan was born on Sept. 19, 1929, in Norfolk County, Mass., on the outskirts of Boston. Her mother, Therese (Russell) Brennan, edited a local newspaper. Her father, Francis Brennan, was a chemical factory foreman who left the family during the Depression, when Liz was 5, a growing pain she shared with her future husband, whose father deserted his wife and children in the Hell’s Kitchen neighborhood of Manhattan when Pat Moynihan was 9.She attended Boston College but never finished because she ran out of money. After volunteering in the first Senate campaign of John F. Kennedy in 1952 and in Adlai Stevenson’s presidential race that year, she moved to New York, where she worked for Gov. W. Averell Harriman’s 1954 campaign and met Mr. Moynihan, who was writing speeches for the governor. They married in 1955.Elizabeth Brennan met Mr. Moynihan while they were both working on Gov. W. Averell Harriman’s 1954 campaign. They married in 1955.via Moynihan familyMr. Moynihan died in 2003. Their son Tim died in 2015, and another son, John, died in 2004. In addition to their daughter, Maura, Mrs. Moynihan is survived by two grandchildren.The family moved more than 16 times during Mr. Moynihan’s career, as he went from Harvard professor to presidential adviser to ambassador to India and the United Nations before reaching the Senate. But they found sanctuary in a 500-acre dairy farm near Oneonta, N.Y., which they bought in 1964. (It was the setting for Hillary Rodham Clinton’s announcement in 1999 that she would run for the Senate from New York.)If Mr. Moynihan played a singular role in public life, retiring from the Senate in 2001, Mrs. Moynihan’s province was also exceptional, in particular among Senate wives, for her hands-on involvement in politics. In “Irish Americans: The History and Culture of a People” (2015), Eugene J. Halus Jr. wrote that Mr. Moynihan was successful in government “in part because of his personality and efforts, but also because of his lifelong partner in politics.”Of his 1998 re-election victory, Mr. Moynihan wrote to a friend: “It is simply that when things got tough we were ready. Liz was ready.”Michael Geissinger, via Library of CongressPeter Galbraith, a former ambassador to Croatia and Senate staff member under Mr. Moynihan, described Mrs. Moynihan as “the architect” of the senator’s 1988 landslide re-election victory, in which he won by a record-breaking plurality of 2.2 million votes.Savoring his victory, Mr. Moynihan wrote to a friend: “It is simply that when things got tough we were ready. Liz was ready.”But he might never have joined the political fray in the first place had it not been for the encouragement and political instincts of Mrs. Moynihan, said Lawrence O’Donnell, another former Moynihan legislative aide and now an MSNBC host.“I don’t think Professor Moynihan could have become Senator Moynihan without Liz,” he said in an interview. “So Pat’s legacy is Liz’s legacy.” More

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    Why Trump Won’t Let Go of His Dream of Domination

    Throughout his life — in his overlapping business, TV and political careers — Donald Trump has attempted to portray himself as what is conventionally known as an “alpha male.” But now he has run into a buzz saw of criminal investigations and civil suits that threaten to reveal both the ludicrousness of his self-image and his failure to meet the traditional standards of leadership.This does not diminish the seriousness of the threat he poses to American democracy.As both a candidate and as president, Trump has repeatedly made grandiose claims. Perhaps the best recent example came during his speech at a March 25 campaign rally in Waco, Texas: “I am your warrior, I am your justice,” Trump told his supporters. “For those who have been wronged and betrayed, I am your retribution.”Steven Pinker, a professor of psychology at Harvard, described one way of looking at Trump in an email:Trump is a cartoon of an alpha-male wannabe, including the ruff of hair to exaggerate his height, his oversize phallic necktie, his defensiveness about the size of his hands and boast about the size of his genitals, his exaggeration of his height in his official biography, his looming behind Hillary Clinton during their presidential debate; his bizarre objection to her taking, like most of the other debate participants, a mid-debate break (“I know where she went — it’s disgusting, I don’t want to talk about it,” Trump said, “No, it’s too disgusting. Don’t say it, it’s disgusting”) and his hair-trigger reaction to sleights and challenges.Dan P. McAdams, a professor of psychology at Northwestern, sees Trump a bit differently, writing by email:Trump’s behavior in office — from his aggressive morning tweets to the Cabinet meetings he held in which obsequious beta males, like the vice president and attorney general, engaged in elaborate rituals of submission in the presence of their alpha — mirrors closely the tactics of domination and intimidation exhibited by alpha chimps in chimpanzee colonies. More than any other American president in memory, and like Putin and Orban, Trump exhibits what evolutionary social psychologists call “dominance” leadership, which is an evolved tendency (tracing back at least 5-7 million years in human prehistory) to attain status and exert influence in groups through brute force and intimidation.Trump’s bid for dominance has never, however, produced majority support. His unfavorable ratings remained consistently higher than his favorable ratings throughout his presidency and afterward, according to RealClearPolitics, and remain so to this day.Let’s put this approach to the Trump phenomenon into a larger context, starting with the work of Amar Sarkar and Richard Wrangham, both of Harvard’s Department of Human Evolutionary Biology. Sarkar and Wrangham are the authors of the March article “Evolutionary and Neuroendocrine Foundations of Human Aggression.”“Socio-cognitive advances in the mid-Pleistocene (781,000 years to 126,000 years ago),” they write, “are hypothesized to have enabled lower-ranking males to form alliances that effectively controlled coercive alpha males.”Sarkar and Wrangham are describing the crucial evolutionary role of coalition formation to overcome the power of “coercive alpha males.” So-called sub-elite males, according to them, had the ability to form coalitions in order to inflict “capital punishment and targeted conspiratorial killing” that would overcome “individuals who persistently or egregiously violate social norms.”At that point, Sarkar and Wrangham observe that “a physically formidable coercive alpha male was nonetheless vulnerable to less formidable sub-elite males who possessed sufficient cognitive capacity to form an alliance to kill the alpha male.”Christopher Boehm, a cultural anthropologist at the University of Southern California, contended in his 2001 book, “Hierarchy in the Forest: The Evolution of Egalitarian Behavior,” that these prehistoric developments are actually tracing “the roots of democracy.”Boehm’s main hypothesis is that “the collective weapon of the rank and file has been their ability to define their own social life in moral terms, and to back up their thoughts about political parity with pointed actions in the form of collectivized social sanctioning.”Boehm goes on: “The ‘democratic’ origins I describe are not recent and historical, but evolutionary and ancient. They date well back in the Paleolithic era and were intimately involved with the development of human nature itself.”In effect, Sarkar, Wrangham and Boehm are describing an early stage of what over time has become an essential ingredient of a civilized, ordered society: the acquisition by the state of police power and the legal use of force to enforce norms and laws.In an email, Sarkar put it this way: “Humans appear to have inherited the capacity to coordinate with one another to enact violence.” While chimpanzees also demonstrate this capacity, according to Sarkar, “one factor that contributes to the uniqueness of human violence is the ability to use language, which allows individuals to freely share thoughts and intentions with one another and to form remarkably precise plans. This means that humans are able to engage in much higher levels of coordination in planning and performing aggression.”Sarkar added that it is “very difficult — or impossible — to connect the evolutionary origins of aggression to contemporary political events.”In their article, Sarkar and Wrangham continue the argument:For coalitionary proactive aggression against a formidable alpha male to be adaptive, it was critical for sub-elite males to ensure that their alliance was stable and that the execution could be performed at minimal risk to alliance members. Only then could they act safely without retribution from the alpha male or his sycophants.This shift of authority and control away from abusive, domineering individual males to collective groups of less powerful men and women had substantial consequences for the composition of society, then and now:Alpha alliances of sub-elite males could kill coercive alpha males, drastically reducing the reproductive success of coercive alpha males. Such control would also have signaled the limits of acceptable intragroup aggression. The direction of selection on male aggression thus changed as a result: rather than selection favoring coercive behavior that males used to achieve and maintain alpha status, the actions of alpha alliances ensured that selection acted against it. Simultaneously, the necessity of coordination and cooperation for targeted conspiratorial killing of alpha males meant that selection favored proactive aggression, and especially coalitionary proactive aggression.The result: “Individual alpha males were thus replaced by alpha alliances of subelite males.”In a separate 2019 article, Wrangham argues:The explanation that best accounts for a novel selection pressure leading to a reduction in reactive aggression starting around 300,000 years ago is the emergence of collective intentionality in the form of language-based conspiracy. The evolution of this newly sophisticated cognitive ability would have led subordinates to socially select against aggressive fighters, creating a reverse dominance hierarchy. The spread of the new style of hierarchy could have occurred by individual learning or by selection of group-cultures, and would have paved the way for diverse selection pressures to additionally influence the evolution of the characteristically human social traits.Where does all this fit in with the state of politics today?The barrage of criminal investigations and civil suits against Trump is, in many respects, the sophisticated and complex way America’s democratic system of government has developed to constrain an ominous, and even somewhat delusional, deregulated “alpha-male wannabe.”Jonathan Haidt, a social psychologist at N.Y.U.’s Stern School of Business, describes Trump in an email as “a unique case. He is a narcissist. He is not hungry for power. He wants attention and praise. So he has some alpha male traits, certainly, but he is not prototypical.”In his book “The Righteous Mind: Why Good People Are Divided by Politics and Religion,” Haidt cites Boehm while making the case that the early acquisition of weaponry played a crucial role in the democratization of authority within groups of humans:Imagine early hominid life as a tense balance of power between alpha males (and an ally or two) and the larger set of males who are shut out of power. Then arm everyone with spears. The balance of power is likely to shift when physical strength no longer decides the outcome of every fight. That’s essentially what happened, Boehm suggests, as our ancestors developed better weapons for hunting and butchering.Once early humans had developed spears, Haidt continues,anyone could kill a bullying alpha male. And if you add the ability to communicate with language and note that every human society uses language to gossip about moral violations, then it becomes easy to see how early humans developed the ability to unite in order to shame, ostracize, or kill anyone whose behavior threatened or simply annoyed the rest of the group.Over time, the aversion to bullying males developed into what Haidt calls “the liberty/oppression moral foundation,” which, he proposes,evolved in response to the adaptive challenge of living in small groups with individuals who would, if given the chance, dominate, bully, and constrain others. Anything that suggests the aggressive, controlling behavior of an alpha male (or female) can trigger this form of righteous anger, which is sometimes called reactance.The liberty foundation, Haidt goes on to say,supports the moral matrix of revolutionaries and “freedom fighters” everywhere. The American Declaration of Independence is a long enumeration of “repeated injuries and usurpations, all having in direct object the establishment of absolute tyranny over these states.” The document begins with the claim that “all men are created equal” and ends with a stirring pledge of unity: “We mutually pledge to each other our lives, our fortunes and our sacred honor.”Pinker argued by email that over the long haul,History has seen the invention of increasingly complex systems that limit the power of the leader, such as coalitions (as per Sarkar and Wrangham), power-sharing or turn-taking agreements, parliaments, constitutions, and rule-governed bureaucracies. Our leader is called a “president” because he merely presides over the government, rather than ruling over it.But, Pinker cautioned,We’re always in danger of slipping back into the dynamic of dominance. In democracies, voters, on average, favor the taller candidate and often crave a “strong leader.” Presidents and prime ministers, for their part, often arrogate more power than the constitution allows. The system of laws that constrains the leader’s power is often tested to its limits, and in countries that are not democracies, their only hope may be what Sarkar and Wrangham call an “alpha coalition,” namely the coup-plotters that many of us hope might someday depose Putin.Rose McDermott, a professor of international relations at Brown whose research has focused in part on the biological and genetic bases of political behavior, provided further explanation in an email: “Humans show self-domestication over time — they become more peaceful — and that may seem like it is not true in light of all the violence in the world, but relative to the death rates in earlier hunter-gatherer kinds of nomadic communities, it is true.”This process of self-domestication, she continued,happens as groups of beta and gamma males (the less strong ones) work together to unseat alphas who exploit the community. They might ostracize him (the alpha male) but mostly they assassinate him. What that means is that slowly over time you get more egalitarian dynamics (such as the birth of democracy, for example).In the case of the former president, McDermott wrote:Trump is a poster child for a “coercive alpha male” and frankly I have been surprised that more Republicans don’t try to take him on directly. I think part of it is that other potential Republican leaders are so narcissistic that they cannot band together in the kind of coalition that historically would have brought down a leader like this in one way or another. This depends on coalitional dynamics: men working together in cooperation, not against each other.Democratic norms, according to McDermott,are one way the country has tried to constrain the negative effects of Trump through things like rule of law and elections (Biden won in 2020). But they have not been as strong as many would like or hope for, and I agree that this is partly (although not entirely) related to increasing polarization (i.e. the inability to form strong united coalitional bonds).As far as “coercive alpha males” go, Trump is a bully, as demonstrated by his treatment both of competitors for the nomination in 2016 and of Gov. Ron DeSantis of Florida now; he boasts of his predatory sexual activity; and he lacks empathy, as reflected in his policies separating the children of detained immigrants from their parents at the border.As the same time, Trump has a long and detailed history of violating the fundamental obligations of a true leader. He is both unreliable and a liar, repeatedly failing to pay bills for services, products and construction; defrauding students who paid to learn about real estate; distorting the truth repeatedly and extensively, about everything from President Barack Obama’s place of birth to the size of his inauguration crowd all the way on through to the results of the 2020 election; promising to “drain the swamp” only to preside over an administration rife with self-dealing.On top of all that, Trump is often simply preposterous, more a late-night TV subject of ridicule, lacking character and the observable qualities of a credible leader, crude more than calculating, a con artist, huckster and hustler.Even so, there are a large number of people who are not persuaded by Wrangham’s line of thinking. John Horgan, a professor at the Stevens Institute of Technology, where he serves as director of the Stevens Center for Science Writings, emailed his response to my inquiry:I have a meta-objection to Wrangham’s use of biology to explain modern social behavior. It’s far too deterministic, it lets us off the hook, it reduces our autonomy. When Wrangham’s ideas seep into popular culture, they feed into peoples’ fatalism about hierarchies, inequality and militarism.R. Brian Ferguson, a professor of anthropology at Rutgers, responded to my inquiry regarding the Sarkar-Wrangham paper by first acknowledging:I come from a very critical position. One foundational difference in perspectives is that my new book, “Chimpanzees, War and History: Are Men Born to Kill?” is intended to refute current primatological consensus that chimpanzees have evolved propensities to “proactively” kill neighbors.Ferguson continued:I have been deeply involved in understanding war, conflict, and politics in tribal societies, and I do not recognize anything like their idea of alphas facing death because of sub-alpha elite coalitions, except in the notable category of segmental tributary chiefdoms and states, where there are rivals near the top ready to rebel, and usually then take over.McAdams, the professor of psychology at Northwestern, does not share Horgan and Ferguson’s doubts about Wrangham. In an essay written in the first year of the Trump presidency, “The Appeal of the Primal Leader: Human Evolution and Donald J. Trump,” Ferguson argued along lines similar to Pinker’s:If angry extraversion and disagreeableness characterize his temperament style, narcissism captures Trump’s underlying motivational agenda. Although some dominant leaders subscribe to an overarching set of values and goals, Trump has no political philosophy to speak of, and his central goal in life is, and always has been, to promote himself. In Trump’s case, narcissism seems to play well with the authoritarian dynamic.Trump, McAdams continues, “harkens back to an older evolutionarily paradigm for achieving status in primate groups. It is the paradigm of brute dominance, an atavistic proclivity whose primal appeal never seems to fade.”Why, McAdams asks, “did 63 million Americans elect a president of the United States who was repeatedly described during the campaign, by both Democrats and Republicans, as a serial liar, a sexual predator, a swindler, a narcissist and a bully?”He answers:No U.S. president in recent memory, and perhaps none ever, has tapped so effectively into the primal psychology of dominance. None has so effectively cultivated an authoritarian dynamic with his followers.In addition, according to McAdams:Trump’s unique personality profile — the high extraversion and low agreeableness, the narcissistic motivations, the “warrior” life story — seems perfectly suited to assume the authoritarian mantle at a time in American history when many Americans crave the security and exult in the excitement that such a mantle seems to confer. Even as he creates chaos, Donald Trump — as president of the United States — confidently assured Americans that he would deliver them from chaos. We will be standing safe and strong in the end. We will win. We will dominate.To some, Trump is less a cause than a symptom of the pervasive contemporary undermining of the American commitment to democratic values.Kevin Smith, a political scientist at the University of Nebraska, argued by email that there is no doubt that there has been a weakening of democratic norms and that this erosionhas loosened the constraints on what counts as behavioral red lines for political leaders. This is almost certainly true for “coercive alpha males,” but I think it is broader than that. As those norms decay there is simply more room available for a range of personalities to get their swagger on in the political arena, as it were, aggressively and openly seeking power to aggrandize themselves and punish those who stand in the way.Smith pointed out that there are no “gender limits here (think of Marjorie Taylor Greene).” In addition, in Smith’s view, the issue goes to the heart of “the corroding of what’s considered beyond the behavioral pale.”In a large heterogeneous republic like ours, Smith wrote, “it is not easy, it is not just a matter of having clear rules or laws, but establishing broad acceptance and respect for the process, something more in the realm of custom, tradition or folk intuition.” But “once established, those norms can help insulate democratic systems from what otherwise is a natural vulnerability to demagogues and tyrants.”Those norms, Smith continued,are incredibly hard to institutionalize, but unfortunately apparently much easier to destroy. And once they are gone they may be incredibly hard to re-establish. If that’s correct, then the end result may be a political system that is indeed more open to shocks of unconstrained “coercive alpha male behavior,” but also to unprincipled behavior among political elites more generally. If there are few costs and clear benefits to such behavior, what’s the argument for not seeking power solely to benefit you and yours and to heck with everybody else?The Times is committed to publishing a diversity of letters to the editor. We’d like to hear what you think about this or any of our articles. Here are some tips. And here’s our email: letters@nytimes.com.Follow The New York Times Opinion section on Facebook, Twitter (@NYTopinion) and Instagram. More