I saw the dc inspired prompt a couple of pages back and got thinking. So, has anyone read the killing joke? It's a batman comic regularly voted one of the best, especially if you're a fan of the joker. The main crux of the storyline revolves around the joker trying to prove that you don't need to be a bad person, or superpowered, or have a particular motive to lose your moral code and do something 'evil'. All you need to have is one bad day where your life lies in tatters around you, everything you love and care about is taken from you until you break, and THEN, then you have nothing left that would stop you (in both dc and marvel the point of no return is usually murder, but its open to interpretation).

Show me Matt's one bad day. Or Foggy's. Or Karen's. Show me how bad of a day they would have to have to do something they would normally consider utterly immoral.