SERIOUSLY. That's messed up. I park my car in my back yard behind my house so no one will mess with my shit but I'm really stupid at the same time because I don't have an alarm. People are REALLY messed up. But dude, at least no one damaged your car too much. That's what some of the kids around here do. A friend of one of my friends has an SI and he just put Z3 fenders on it. He has a carbon fiber hood too. Not only did someone break into his car and smash out a window, they smashed the fenders and the hood. This kid didn't do anything to anyone. I don't know, if I were you I would try to catch whoever it is that's doing this.
Kick his ass.