Why does the thief bother to track your car back to your house to steal later? Why not just drive around the residential areas where the cars are parked and just choose one at the time you want to do the theft?
Unrelated, he also had a room in his apartment set up to grow weed, with some serious climate control and artificial lighting. He was dealing this pot. He had no papers or permit to stay... what crazy folk.
Yes, because unlike in Europe, people in USA have the right to shoot you dead if you're trespassing in their property.