^^^
One thing not mentioned about how humans have gotten around their aversion to killing is the application of summary executions for cowardice.
It wasn't that long ago that if a soldier shelled up and couldn't fight during combat, they'd be taken out and shot themelves. Maybe not every single one of them, but enough that it certainly motivated people.
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"A pessimist thinks things can't get any worse. An optimist knows they can."
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