My grandmother used to watch the news and announce "hanging's too good for him". I took her literally, and still do. Hanging would be too good for him. Hangings ends your life, but because you're then dead you don't feel it, only the people around you are still alive to feel it.
No, my preferred option is that they should have a long and unhappy life in prison, knowing there is zero possibility of parole, knowing everyone you encounter in prison thinks you're less than human, knowing only death will end your punishment.
Hanging's too good for him.