It's a complex issue, since I see both cases as equally valid and neither being fundamentally flawed. Personally, I'm not particularly strongly against the death penalty, I think it can be justified given certain conditions. Unfortunately, I don't think there's a good way to legislate this, since law is black and white and has no connection to 'justice'. I'd much rather see it never introduced than introduced with inappropriate definitions or restrictions.
The chance of them being caught and killed for their actions probably isn't going to phase them if they're already planning on taking their own life.
If they're planning to take their own life, I don't think any punishment is going to faze them
What about the guy who threw his daughter over the Westgate? He'll be isolated for his own protection, but doesn't anyone want to simply... kill this guy?
Justice v. revenge, which is one of the problems with introducing the death penalty. If you let people make decisions based on emotions or how shocking a crime is, it's not going to end prettily. I suppose it gets even more clouded when you introduce the whole issue of psychiatric disorders and mental issues and whether or not you can consider somebody to be responsible for what they do in this case.
And for those of you that believe in an afterlife and the concept of Hell, would you be more eager for the death penalty so people like the one above can get to eternity quicker?
From a purely semantic perspective, if afterlife is eternal it's irrelevant how long it takes them to get there. In any case, I don't think the next life (whatever, wherever it is) should be a basis for decisionmaking on this scale