The stigma of Cannibalism is a social agreement - like all moral codes it comes from a common need a society shares. Any religious, philosophical or lawful extension of this social agreement doesn't elevate it to a higher level or give it deeper meaning. For example: the issue of souls really doesn't have any merit in the argument - those who don't believe in souls still don't want to be eaten by their coworkers.
We are at the top of the food chain and want to remain there. Nobody wants to be eaten. Other humans are our only natural predator. Hunger is a common challenged faced by human being and we want to be certain that we or our families are not threatened by hungry humans. We want others to die of starvation rather than commit murder in order to survive. I'm sure there are biological barriers as well. Cannibalism can be dangerous in a species. I believe it to be that simple.
Eating animal...I'll get to that another time
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