Question is not why people havent thought of this, question would be; Is it practical?
Maybe to steal something from inside a car. But that would be an important think and there would be a need to plan the attack. I don't think a valuable item would be transported in a vulnerable car or that people who could actually use a system in a cellphone that would be all elaborate to unlock cars would just vandalize a random target. Maybe stupid lamer kids who think that because they once used some stupid program to take advantage of a stupid exploit are hacker, lololol