evolutionary psychologists have also suggested that altruism towards strangers may be a kind of mistake, a “leftover” trait from when human beings lived in small groups with people we were genetically closely related to. Of course, we felt an instinct to help other members of our group, because our own survival depended on the safety of the group as a whole, and because, more indirectly, this would support the survival of our genes. We don’t live in small tribes of extended family anymore, but we habitually behave as if we are, helping the people around us as if we are related to them.
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