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"It seems to me that reducing reactive aggression in humans would require biological evolution. We would need to select against people who cannot control their rage."

This is precisely what happened, and continued to happen right up until about 40-50 years ago, but it wasn't natural in the sense that we had no hand in the process. The reactively violent and the proactively violent (when we could identify them) were selectively culled ASAP. We no longer do this very well, and are getting increasingly bad at it.

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"It seems to me that reducing reactive aggression in humans would require biological evolution. We would need to select against people who cannot control their rage."

According to Wrangham's 2019 The Goodness Paradox: The Strange Relationship Between Virtue and Violence in Human Evolution, that's exactly what happened. As an example, if someone was too disruptive, five people would go out hunting and only four would come back and no one would ask any questions. It was basically capital punishment for assholes.

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