How would you feel if a vigilante....?

This is a hard one for me as a christian, because killing is wrong. But the amount of damage done to people and their families, is heart breaking. I don't think they should be killed, but I do feel they should be stopped, however, if that did have to happen, there would be killing involved, hopefully more good people killing the bad guys, because they are selfish and greedy, and I wont feel bad or that it was wrong if killing them is what it takes. Tough one morally, but human nature... I do believe they should be stopped, even if most of them will end up getting killed, cause I highly doubt they would give up without a fight.