If someone deserved to be stabbed, would you do it?

No, because, for a start, it's completely subjective whether or not he deserves it when you should've used your powers to deal with him if he was breaking rules.

Secondly, going back to the analogy, it's illegal to murder someone, you wouldn't do it, even if you thought they deserved it. It's the same thing. Your attitude is bad.

If someone deserved to be stabbed, would you do it? No, because, for a start, it's completely subjective whether or not he deserves it when you should've used your powers to deal with him if he was breaking rules. Secondly, going back to the analogy, it's illegal to murder someone, you wouldn't do it, even if you thought they deserved it. It's the same thing. Your attitude is bad.