If another car isn't there to stop it, the car has now gone through my kitchen or my daughter's bedroom.
100% throttle for 15 seconds on a multi-level parking garage means my car has now plunged N stories, or gone for a swim into the pond/river/drainage ditch behind the parking garage.
Don't be judge, jury, and executioner.
Or in less cliche terms: separate the asset recovery function (where you can help without moral issue) from the law enforcement function (where you cannot help without creating moral and privacy issues).
Just immobilize the car: the car's owner, leasing/financing company, insurance company, and police department will all be happy with just that.
Alternatively: person is stealing your car, you have decided that theft deserves the death penalty, you execute them with your car.
Someone steals your car, your car accelerates and turns hard left, killing the occupants of other cars around them.
Seriously, I don’t get people who are so hell bent on trying to come up with ways to execute people for committing crimes.
I've also thought of this.
1. Lock doors, secure windows.
2. 100% throttle
3. after 15 seconds, 100% steer left
Of course, there are certain... moral issues... surrounding this idea which have prevented it leaving the notes on a napkin stage.