Actually, the spike strips are safer and more effective than punching holes in the radiator. You can continue to drive a car several miles after the coolant has jumped ship.
Not that a 12 gauge slug won't cause all sorts of havoc under the hood though. Batteries don't react well to bullets either and the resulting short circuit can play hob with onboard computers.
On a side note, one may ask why not use the slug on the windshield to get the driver. Windshields don't pose too much of an obstacle and you're likely to reach the driver. But then, you just created a runaway 2-ton blunt instrument that can injure innocents. It's safer to try to stop the vehicle then deal with the occupant.
BillCA in CA (Unfortunately)