or just lock him up in isolation until he dies?
i agree he will never be stable enough to be trusted to be let loose, but death is not the answer.
also, if he is in isolation, it gives people a chance to study him, and maybe learn about certain tell tale clues (prior to the animal killing) as to what makes him act the way he does and with this evidence stop it happening in future.
You say 'death is not the answer' like there is a problem here that needs solving? There isn't. He's an amoral sociopath with delusions of grandeur. Locking someone up in isolation forever is arguably worse as it could increase suffering. Studying him? To what end? He's no better / worse than any of the twisted individuals before him.
To stop this happening in the future requires that the evidence be acted on next time. I agree that killing him wouldn't help anyone else, but I'd still be happy for it to happen.

