Dan Jones stated that "The decades since have not been kind to these cherished beliefs. A growing number of psychologists, neuroscientists and anthropologists have accumulated evidence that understanding many aspects of antisocial behaviour, including violence and murder, requires the study of brains, genes and evolution, as well as the societies those factors have wrought." Evolutionary psychologists generally argue that violence is not done for its own sake but is a by-product of goals such as higher status or reproductive success. Some evolutionary psychologists argue that humans have specific mechanisms for specific forms of violence such as against stepchildren (the Cinderella effect). Chimpanzees have violence between groups, which has similarities to raids and violence between groups in non-state societies. Several studies have found that the death rates from inter-group violence are similar for non-state societies and chimpanzees. On the other hand, intra-group violence is lower in humans living in small group societies than in chimpanzees. Humans may have a strong tendency to differ between ingroup and outgroup, which affects altruistic and aggressive behavior. There is also evidence that both intra-group and inter-group violence were much more prevalent in the recent past and in tribal societies, which suggests that tendencies to use violence in order to achieve goals are affected by society. Reduced inequalities, more available resources, and reduced blood feuds due to better functioning justice systems may have contributed to declining intra-group violence. References External links Full text of the Seville Statement on Violence Adams, D. (1989). "The Seville Statement on Violence: A Progress Report", reprinted by permission from Journal of Peace Research. 26 (2): 113–121, retrieved May 16, 2016 1989 in law UNESCO Political statements Seville 1989 in international relations 1986 documents