Indeed, a big reason why many if not most vehicles are stolen is because dumb clucks leave them idling.  (Remember the woman whose care was stolen withe her baby inside.  Didn't it occur to her that her baby could have died from carbon monoxide poisoning?)  I know of people who will leave their vehicles idle for hours.  ... and forget about pollution and the criminal waste of energy.   It is sort of criminal Darwinism.  Having said this, many if not most of these people have little to fear from the criminal justice system.