Most cars are stolen by non pro car thieves. They're stolen based on opportunity and whether or not its in an area where under 25s might need transpo. They're going to steal the easiest thing, because they're often just looking for transpo.

We lived on a street frequented by under 25s at night and used clubs on our cars. They were never stolen, but the neighbors who had easier to steal vehicles such as Dodge Caravan were taken quite often.

You're not going to stop a pro.