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Humans May Not Be as Hardwired for Violence as We Thought

Humans have biological capacities relevant to aggression, but “hardwired” overstates what evolution can tell us about when violence occurs.
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Humans have biological capacities and evolutionary histories relevant to aggression, but that does not make violence inevitable or equally common in every person, society, or situation. “Hardwired” is too blunt: it can make a flexible, context-sensitive behavior sound fixed.

What does “hardwired for violence” mean?

The phrase can refer to several different claims: that humans are capable of aggression, that evolution shaped some tendencies related to it, or that violence is unavoidable. Those claims are not equivalent. An evolved capacity can be expressed differently depending on circumstances; it is not proof that a behavior is genetically determined or destined to occur.

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Aggression also has costs as well as possible benefits. The 2013 review “When Violence Pays” frames it as behavior whose consequences depend on context. An evolutionary explanation may help describe why a capacity exists without explaining every instance of violence—or establishing that it cannot be restrained.

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Violence is not one behavior

“Violence” can mean an assault between individuals, homicide, organized warfare, or aggression between groups. Evidence about one form cannot automatically settle claims about the others. A theory about intergroup conflict, for example, is not by itself an explanation of why a particular person commits an assault.

The scale and setting matter, too. A pattern observed in one population or period does not establish a universal rule about human behavior. To assess claims about human nature, ask what kind of violence is being discussed, who or what was observed, and whether the claim describes an observed pattern or proposes an evolutionary explanation for it.

What different evidence can tell us

Evidence What it can contribute What it cannot establish on its own
Skeletal trauma Injuries preserved in human remains provide direct evidence that some people experienced physical violence. The 2001 review “A Bioarchaeological Perspective on the History of Violence” discusses this approach to studying violence and warfare. Injuries that were not preserved or discovered are missing from the record. Skeletal evidence alone cannot reveal motives, social rules, the full frequency of nonlethal conflict, or whether an injury arose in organized warfare.
Archaeology and ethnography These sources help scholars examine conflict and cooperation in particular societies and settings. The 2018 Annual Review of Anthropology article “Hunter-Gatherers and Human Evolution: New Light on Old Debates” reviews how such evidence is used in arguments about human evolution. Neither archaeological remains nor accounts of particular hunter-gatherer societies offer a single, timeless portrait of all human ancestors. The review warns that this evidence can be used inaccurately on either side of the debate.
Comparative evolutionary analysis “The phylogenetic roots of human lethal violence,” published in Nature in 2016, compares humans with other mammals to examine the evolutionary history of lethal violence. A long evolutionary history of a capacity does not show that violence dominates every society or situation, or that warfare is inevitable. The article also describes avoidance and friendly relations with neighboring groups as responses to intergroup conditions.

These kinds of evidence answer different questions. Observing an injury is not the same as explaining its cause; documenting a conflict is not the same as showing that violence is a universal default. Keeping those distinctions clear helps prevent findings about one time, setting, or social scale from being stretched into a sweeping claim about humanity.

Why scholars disagree about the human past

There is a persistent debate over how much aggression and competition, compared with cooperation and nonaggression, shaped human evolution. The 2018 review on hunter-gatherers places this disagreement in context and cautions against treating particular populations as direct stand-ins for all human ancestors.

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A related tension appears in a 2023 review, “Evolutionary and neuroendocrine foundations of human aggression.” It describes humans as capable of being exceptionally peaceful and exceptionally violent, and reviews a social evolutionary theory intended to account for both. That is a theoretical synthesis, not final proof of one causal model. The combination of cooperation and violence is itself a reason to be wary of a single, simple account of human nature.

What claims about sex differences do—and do not—show

A 2017 chapter by Hill and colleagues reviews evidence and hypotheses concerning male contest competition and physical aggression, as well as coalitional aggression. It also discusses human peacemaking and the possibility of long periods without violence toward rival groups.

Reported population-level patterns should not be turned into predictions about every individual. Nor should an evolutionary interpretation be confused with an observation: a proposed adaptive explanation is one way to interpret a pattern, not proof that biology fixes an individual’s behavior.

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What the evidence supports

Evolutionary history can inform questions about aggression, but it does not settle how violence arises in any particular modern society. The evidence described here supports a more careful account: humans have capacities relevant to aggression, and human history includes lethal violence, but it also includes avoidance, cooperation, and peacemaking. How these capacities are expressed depends on the behavior, setting, and social conditions under discussion—not on a simple, universal switch labeled “violent.”

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