Except they were law abiding citizens going about their lives, harming no one. And no, I don't view it as a deterrent. If he can never live among society again, just end him and let him pass from memory. I dont want to read articles 30 years from now like I still do about Manson about whats up with him in prison. And possible socoetal benefit of keeping that insane bugger alive for 40 years is far, far outweighed by the cost of keeping him alive for that long. Manpower, food, housing, etc, not worth it.