Person breaks into your car to escape violent gunman (let’s assume we’re in America), your car summarily executes them.

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.