Technically they're a different species of homonoid/not human and they have weird health problems, cannibalism seems to help them maintain health.
damn that post id! Ok then technically not cannibalism it's still murder and supremely messed up.
I don't know anything about that, I think if they thought that would work they'd have no problem doing it.
They're from the line of Cain, same species of mother as the rest of us but a non human father.