Evolutionary psychology is pretty scientifically bankrupt with a good majority of the field revolving around story-telling that you can use to judge pretty much anything.
Pretty much the only thing we can say for certain is "human nature" is incredibly fluid. We can also trace the origin of lots of "moral" things, like the onset of communities, the codification of rules of behaviour and justice for trangressors, as well as changes to more monogomy and child rearing behaviours. But for why they happened, who knows?
Old father time.
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