Like I said before, arrest the buyers, and the problem will be more than half taken care of.Since its a federal mandate that cars have to have them, then it should be a federal offense to illegally buy them. But uncle sugar has more important stuff on his plate now, what it is who knows. As far as harming the thiefs, if the guy is a career criminal, and you injure him, and he can't persue his chosen profesion, there is a good chance he will be eligible for first, workmans comp, and then ssi benefits. Plus you stand the chance of being arrested for battery, and then sued. and since battery is a felony, you may wind up in jail, sitting on some brutes lap. Its a wonderfull world trala tra la!