"The child who received a great deal of attention, whose every need was promptly met, as among the New Guinea Mountain Arapesh, became a gentle, cooperative, unaggressive adult. On the other hand, the child who received perfunctory, intermittent attention, as among the New Guinea Mundugomor, became a selfish, uncooperative, aggressive adult...

Another relevant aspect of most of these cultures is that there are very few models of adult aggression, including the physical punishment of children. There is virtually no hitting, fighting, killing, warring or verbal "put downs." Even psychotic behavior is virtually nonexistent. Cooperation is rewarded; aggressive conduct is discouraged...

Among the !Kung Bushmen... when the child's aggression is toward a younger child, the aggressor is scolded harshly; if toward a peer, the children are distracted or separated if necessary; if toward an adult, the behavior is usually ignored."

Child Raising In Non-violent Cultures