What it amounts to is the visual gratification of your rebellion against the system.
You want to make it stop. Then paint over it when it happens; immediately. Don't give the depraved little vermin the opportunity to enjoy what they did.
Also keep this crap out of the papers and off the 6:00 news.
And if you do happen to catch the little bastards that did it. Wait till they go to work at McDonalds and then spray paint "I
Garth Brooks" on the side of their tricked out Honda Civic.
That'll teach em.
If they can read.