*shrugs* Long-term imprisonment can lead to suicide too.

I saw a programme on TV where they were showing examples where the behaviour of sex offenders had apparently changed dramatically for the better because they had been chemically neutered (or at least that was what I thought the treatment was). Far from seeming depressed (and I know that sort of thing isn't always obvious) they were apparently happily contributing to their community and really enjoying life.

I can't speak for the truth of that documentary though. There's often bias. I'm just going by what I've heard. Certainly I was only pointing it out as a possible route for discussion once it's recognised that there are alternatives to "kill 'em all".