Has the world gone mad?

Following on from the knife discussion, as luck would have it, I was attacked by a guy with a broken bottle last night. I was working the door of a fairly rough pub last night when I was asked by the door staff if I would eject a drunk customer who was being abusive to staff and some female customers at the bar. I politely asked him to leave at which the scrawny little git (aren't they always) smashed his glass and attacked me with it. I did a standard knife to the upper quadrant defence, perhaps a little more vigorously than was necessary, resulting in a sprained thumb for myself and a bruised forearm for him. Net result was I spent most of the night in a police cell, he walks away scot free and he's going to sue me for assault. He claims I attacked him unprovoked and he has witnesses - his drunken mates - to prove it,My lawyer reckons it's just a nuisance suit that will go nowhere, but really who needs the hassle? My job basically involves looking after people and keeping them safe but sometimes it really doesn't seem worth it. Looks as if I’ll have to retrain again. Always fancied being a social worker, but that maybe a case of jumping out of the frying pan into the fire?