People have a voice. Animals don't. People can fight back. Animals can't. People can say "OUCH". Animals can't.

I'm not saying these people had the choice, the definitly were helpless, but they surely have more of a chance than lets say a cat would.

Besides, I think he should get off of this earth as quickly as possible, too risky having him here. You never know what he's capable of and sitting in jail it's possible there may be a way he could escape.