Hell, let OnStar (OS) have 3 buttons...
Button 1 - Talk to driver.
Button 2 - Slow car down, then off.
Button 3 - Car blows up, no trial or criminal to contend with.
If the car hasn't gone too far and the LEOs are still tracking it down, button 1 should do the trick...
If the car is starting to run, or is running, and there hasn't been any damage to it, then button 2 is your choice.
If the guy is running down fire hydrants, has already shreaded the Bridgestones, has applied street-side antiquing to the side-panels and has generally trashed the beast (and there's no one else inside...except his "hoodies"), button 3 for civility and entertainment value...you know there's got to be a helo in the area...
Film at 11!