Is Revenge Ever Justified?

Is revenge ever justified? In my opinion, no. I don't think revenge can ever be justified. I know sometimes you just can't accept what someone has done to hurt you and you just feel like you have to take revenge on that person. People may tell you, "just let karma do her work!", but you just can't wait anymore. What if that person escapes karma and is never punished for whatever terrible things he/she did to you? Well, that is very true and absolutely understandable. However, have you ever taken a minute and just think about when your revenge should stop? Is your revenge too extreme? Does that person really deserve it? What did that person do anyways? Are you sure it's only that person? Have you ever thought maybe that person teamed up with someone else who also deserves to be punished? The list could go on and on. My point is that revenge is a very complicated thing, and if you haven't really thought it over, don't do it. Just let karma do her work and don't waste your time on your enemy. After all you only have so much time left to live, why waste it on someone who you hate?