Um.. shoot through the glass?
He mean, you shoot the abuser through glass.
Exactly... besides, I have an old saying.. "Anything can be abused" So whether you're abusing passenger seats, or abusing driving your car, or abusing house rob, or abusing briefcase, or abusing wall bugs, or abusing shooting behind the car... you can abuse anything. So this is not really anything to be concerned about since you can shoot the person abusing through the cars window.
I don't really like this idea, sorry.For the reason such that would look ugly, would be piss taking, and could cause difficulties. Difficulties of when you want to push your car to the nearest pay 'n' spray, and etc.