[Sciolist]

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psychologically speaking I go with our bellicose nature. we'd be a fuckload better off if we were down with one another's differences and whatnot.

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Ah, but if you have a population of nice people, the best strategy is to take advantage of them, to be mean. Those things are inevitable, and we inevitably end up in a stable state. Sometimes there're several stable states, but they might not be reachable through evolution. It's down to game theory, and can't say I know a great deal about it...