Originally posted by Hypatia_Alexandria
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You are employing a morally subjective phrase i.e. "perfectly acceptable" which suggests some form of moral position on the behaviour you have outlined. I would also point out that organised warfare is a comparatively recent human phenomenon.
However, at the biological level the behaviour you have described may be a necessary requirement to ensure the survival of one specific group, albeit at the expense of another, and of course individuals from the defeated group may be incorporated into the victorious group.
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