Support the comic on
Odds and Ends
14 5, 4:45am
If said person is genuinely about to commit murder and killing them is the only (and I stress the only) way to stop them, then sure. But if someone went around murdering Neo-Nazis just hanging out in their clubs, that's never justified or moral in my book, it's still murder and if you kill a lot of them it's genocide. If they have committed crimes, they should be arrested and put in prison.
The idea of killing your way to a better world is a terribly dangerous concept. It might start with Nazis, and then lead on to other groups.