Yeah, the whole humans are super violent really only began around the time of the Enlightenment with the state of nature arguments on behalf of centralized power.
We really tend to form heuristics about the past based on a few scant pieces of archaeological evidence, and some nifty, sloppy cross-species analogies with our closest primate cousins. Even that bit of reasoning appears to be suspect as chimps - the most common analogy for violent people - don't even appear to be all that violent outside of a few select groups.
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