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It is what it is (Tim Kreider)
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not an expert but [citation needed] on the "within-group violence" statement. From what I remember they quite often sacrificed captured slaves from other nations and ethnicities.
I don't have any numbers on it but it's often both. Sacrifice, as a religious practice, has a lot of variation.
But I'm not aware of any serious claims that ritual sacrifice has anything to do with genocide.