[3] UNESCO decided to disseminate the Statement widely in a decision of the twenty-fifth session of the General Conference on 16 November 1989.
[14] John Horgan reported in 2009 that 185 out of 205 surveyed students at Purdue University believed that humans would never stop fighting wars.
[16] Scientific papers in both evolutionary psychology and neuropsychology suggest that human violence does indeed have biological roots.
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.
On the other hand, intra-group violence is lower in humans living in small group societies than in chimpanzees.