Purely from a logistical perspective...
The thing is, you wouldn't want to eat meat that had been there for a few days, would you? You'd only want to eat it either shortly after the animal had died, or if it had been quickly prepared and chilled or similar. Not a problem with animals as they are generally killed for meat, you don't eat meat that you find dead.
The obvious problem with using humans for meat is that killing humans is wrong, or at the very least considered wrong. On that basis, the only human meat that could be obtained ethically would arise from natural or accidental death. I wouldn't want to eat any meat, human or animal, from an animal that died of natural or medical causes... and accidental death poses other problems.
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