Why don't you just kill the right kinds of people?
Wait around in the shadows for rapists or muggers to make the first move, then make the second. People like you are useless because you never use your psychosis as though it were a strength, you're always so focused on the fact that society condemns it as a hindrance.
Only you and a handful of others can murder the violent criminals and be alright with it. Don't you see that you're cut from a special slab of flesh? Use your attributes, whatever they are, to their fullest.
Just as you wouldn't want your white mage doing the attacking, you wouldn't want your vigilante working behind the register.