I dont tag or hit up Churches, cars, small businesses, local stores, and in some cases windows. Depends where and who owns it i guess.
I wouldn't do that to a new car. I would do it to a POS the owner doesn't give a shit about or a car covered in stickers already, but I haven't slapped any cars. I like to put em on company vans and U-hauls-Tho I wouldn't bomb any of those vehicles, unless abandoned.
I don't bomb Churches, Hospitals, people's personal homes/vehicles, schools, that's about it... I hit box trucks, store windows, etc. whether they are abandoned or not.