But you guys love doing that, I thought bumper stickers were the rage in the US ?
I would say that any cars that look like tourist cars, whether they are rentals or from abroad, have a higher risk than locals cars. I would geuss that it has more to do with the amount of loot you can score from a traveller as opposed to a local who problably has minimal gear in the vehicle.
Follow the usual protocols and I am sure you will be fine, out right vandalization is rare.