She based her extraordinary claims of no rape or murder among South Pacific Islanders on a stay of only a few months where she lived with a missionary rather than among the people she was studying. In point of fact, the very people she was studying had a rate of rape nearly equal that of London of the same time period. In terms of murder and war, she happened to be visiting at a particularly peaceful time. Aggressiveness is not the only intriguing parallel which Wrangham and Peterson have presented. Bonobo apes have peaceful societies, largely because of a dominance hierarchy shared by both the males and females.
Females enforce their co-dominant status by mutual support when status is threatened.
This requires close alliances among the females which are cemented through homosexual behaviors. Wrangham suggest that mutual support by females may possibly solve the problems of human male aggression. While I find their suggestion premature based on the evidence, the contrasts with other ape species certainly seem worthy of further exploration. The shortcomings of the text should be noted. It is a strong socio-biological view of human behavior.