Book recommendation: "Behave: The Biology of Humans at Our Best and Worst", by Robert M. Sapolsky.
Summary: our good behavior and bad behavior are both driven by a terrifying multitude of factors, and it is never due to just one thing or the other, and it is all very, very, very complicated.
You should actually read the damn book. Learn about our own primate brains from the neuro-endocrinologist who studied baboons in the wild for thirty years!
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