Abstract
This cross-cultural study investigates why some societies have more interpersonal violence (homicide, assault) than others. Multiple regression analysis suggests that socialization for aggression in boys in late childhood is by far the strongest socialization predictor of higher rates of homicide and assault. But why socialize boys for aggression? Other analyses suggest that socialization for aggression is a likely consequence, not a cause, of war. The theory of violence suggested here is that war is the major cause of more homicide/assault. We suggest that the effect of war is mostly indirect, by motivating parents to socialize for aggression. In addition, war may have some direct effect by legitimizing violence. According to the theory suggested here, high rates of homicide/assault are inadvertent (unintended) consequences of the need to produce effective and unambivalent warriors.
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