Here’s the thing though.
I agree 100% that the world is probably better off without this asshole in it.
But I don’t think we should be doing that. For every one of these guys, you’ll have another guy who got railroaded by a crooked prosecutor, or who will later be proven innocent with better DNA testing. There’s just no way to be sure every one is ‘good’, and I’d rather let bad people live than accidentally kill good people.