Don't give the OP such a hard time. In some parts of the world, this is an obviously stupid thing to do; in other parts of the world, it is not unreasonable and he'd have to be very unlucky to have it stolen in these circumstances. I had a European student visiting my lab a couple of months ago. He was given an old bike to use during his stay, and towards the end of his stay, decided that the best way to dispose of it would be to leave it unattended in the city centre so that it would be stolen. He was surprised that it was still there when he came back from lunch, and flabbergasted to see it still untouched a few days later. Our expectations and understanding of risk are shaped by where we live.
Where I live, I would not leave a new iPhone or Apple bag visible through a car window, but I would feel comfortable leaving it tucked out of sight in the footwell. In some places, this would be stupid. In other places, leaving it visible would be fine.