My issue with cannibalism would be that the healthiest cannibal diet would involve eating people as far removed from your own gene pool as possible and I'd genuinely be a bit worried that other people might interpret that as racism which, I think, makes me the most politically correct human being who has ever lived and so I now appoint myself god king of everything.most old cannibal tribes only eat their enemies. after killing an enemy spy from the other tribe now you have this big piece of meat and a starving tribe. most cannibal tribes didn't kill for food they killed for other reasons and just made the best of a dead body that they had to dispose of in one way or another. personally I think the made they right decision. if I had to kill someone for self-defense in a society with little resources I would make the same decision.