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[Humans] have been genetically programmed through hunting behavior: cooperation and sharing. Cooperation between members of the same band was a practical necessity for most hunting societies; so was the sharing of food. Since meat is perishable in most climates except that of the Arctic, it could not be preserved. Luck in hunting was not equally divided among all hunters; hence the practical outcome was that those who had luck today would share their food with those who would be lucky tomorrow. Assuming hunting behavior led to genetic changes, the conclusion would be that modern man has an innate impulse for cooperation and sharing, rather than for killing and cruelty."The Anatomy of Human Destructiveness"