No, I didn't say you had an extremist opinion about being against the death penalty. I myself am against the death penalty. You having an extremist opinion comes in when you start equating all violence as the same, ignore the many motivations and reasonings of why people would be happy at other people getting hurt, and even claim that being happy that someone is getting hurt is morally equal to committing a terrorist attack.
It seems that your opinion essentially boils down to the idea that it's not ever good to be happy when someone gets hurt, and that's an extremists opinion for sure. It colors the situations as nothing more then black and white, with two sides being absolutes. You have no middle ground in your opinion from what I can see. It's "If you enjoy someone getting hurt, you're as bad as someone who actively goes out and hurts people.", which sounds pretty extremist to me.
No, I think it's extremely dumb to color the situation as black and white, and to judge these two groups of people equally. Me bringing up the law is evidence that trying to do that is a really dumb, unreasonable thing to do. It's not just a matter of revenge, because I think that there are many situations where revenge isn't a good enough excuse to kill another person. If you'll see above, I don't actually support the death penalty. Mostly because I don't think it will ever work in practice and that there are too many errors to be made. The only thing I've taken issue with is the blindingly dumb opinion some people seem to be holding where they are trying to claim that supporting the death penalty is equal to the motivations of a terrorist.