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For those wondering what I'm referring to, if someone invokes a "human nature" argument, chances are good that it's folk sociology: assumptions about human interaction based solely on intuition. I dislike these kinds of arguments because people give them without concrete supporting evidence. Example: humans are naturally selfish because that's how they survive in the wild. So what about the times people are not selfish? Why do animals form groups then?
Humans are complex, and you can't simplify them to single causes and effects or motives like folk sociology does.