In general, our morally tinged cultural institutions-religion, nationalism, ethnic pride, team spirit-bias us toward our best behaviors when we are single shepherds facing a potential tragedy of the commons. They make us less selfish in Me versus Us situations. But they send us hurtling toward our worst behaviors when confronting Thems and their different moralities.
( Robert M. Sapolsky )
[ Behave: The Biology of Humans ]
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