Suffering is an immoral thing we as a people should try to evolve. While of course, the idea of flaying Jimmy Saville would certainly be enjoyable, it's ultimately just the lizard part of my brain talking and morally, that suffering does no one any good.
I don't have any problem with the death penalty in theory. If I a known mass murderer who we're putting in jail for the rest of his life, I think it's fair to just execute him and be done with it. Jailing should be used for rehabilitation, and if we're locking people up and throwing away the key, seems like it'd be easier and more merciful to just kill them.
However, in practice, I think it's an incredibly flawed idea. Just looking at the rates of people on death row who were found to be innocent, the idea's nonsense and should never be considered. We shouldn't kill people because there's always a chance of innocence, and a pardon's of far more use to a living man than a corpse. The fact that there's so many cases of innocent people being executed tells me the death penalty isn't a good idea and should be avoided.