This is like asking "Why do the police matter? I've never been the victim of a crime!". The police are protecting you because they offer a deterrent to crime,

This is like asking "Why do the police matter? I've never been the victim of a crime!". The police are protecting you because they offer a deterrent to crime, and the civil law protects by providing a deterrent to your employer fucking you over. Signing away your right to sue your employer when they give you the shaft is just as stupid as signing away your right to call the police when someone steals your car.