What a crock...
The 'Graffiti Community' just needs to be given some "Theraputic Assistance."
If/When caught, as a mandatory part of the 'sentence', they should get to experience some Theraputic Aversion training of painting or white-washing/scraping/cleaning any and all (not just their own graffiti) deemed a problem. I figure 100 hrs, minimum should be adequate to sink home the message. Do it when you've got three or four of the young mis-understood
youths punks lined up by the court system and you can have a supervised chain-gang of sorts.
Refuse to do it? Back to the Juvenile courts (ok, not much of a threat, granted) or a stay in the Barton crowbar motel for you.
I'm sure word will get around fast within the 'graffiti community' that there are far better things to do with their mis-spent time than tagging.