Evolutionary theory as a lens with which to investigate the origins and psychological mechanisms of war. Partly stemming from misapplication of metaphors such as "survival of the fittest" and the "struggle for survival," it was assumed that Darwinian processes could only produce selfish individuals that care not for the welfare of others. In the case of coalitional violence, early ethologists argued that chimpanzees and humans naturally strive to dominate each other and that aggression is the inevitable consequence of competitive social environments.
For millennia, group boundaries have organized our identities, motivated allegiances, and inspired feats of coordination the likes of which are unparalleled in the animal kingdom.We hypothesize that psychological adaptations exist that structure the way we think about groups, and that regulate cooperative and competitive behavior in the context of specific coalitional dynamics; specifically, we argue that humans are endowed with an evolved “coalitional psychology.”