If I was criminally inclined I could have driven off in an m3 or a 3.0 tdi a5! both drivers left the engine running whilst they popped round the corner to post a letter!
That'll be greatly people living in areas where crime is minimal like where I am now, here some peeps even leave the doors open for the dogs when they go on holiday, and leaving the car running while quickly going into the shop is common, in the city, like Sydney, peeps lock up activate alarms etc. Still stupid though, but living in a crime free area can make you very complacent.