in your own words, the difference between "moral" and "practical"? I would love to hear it.
Polinesian cannibalism seems to be associated with warfare wherever I can find it on the Internet. And we all know that prisoners of war aren't really people, don't we? Can you point me at non-war-related cannibalism?
Hazing rituals? Again, not everything a person does is moral. It's more a case of "I suffered for somebody else's fun, therefore you shall suffer for my enjoyment". Very human and practical, but I doubt that the prerpetrators pause to think about right and wrong (as opposed to pleasant and "cool"). Additionally, in extreme cases (such as gang or cult initiation rituals), people who undergo it are not quite people yet - they have to earn that privilege.
Can't argue about "Tools of Satan". I guess you have me there. My only answer is that such people are a rarity, and, if you get them together in one place, aren't likely to form a stable society.