Revenge

I talked with a friend today about revenge. It's a funny feeling. Society tells you to suck it up, to move on, that it's best to take the high road....but what if your anger is justified? In her case, it sure damn is. So, do you just wait for karma to do its' thing? And what if you don't believe in karma? Can revenge be a solution to a problem when your feelings are justified and fit the facts? Can revenge give you closure? Does it make you a bad person or jus ta person who finally stood up for themself?