With 5 million subscribers, you're going to get a few undesirables. Statistically, the person behind the Tauren might occasionally be a murderer or a child molestor. Hell, you could even be ganked in STV by an Orc Hunter that just happens to be Kim Jong Il, or maybe even Saddam is the Undead Rogue camping the farm in AB.
But graffittiists? Those malicious destroyers of public property? World of Warcraft is not free of them either. Here, they have marred the beauty that is an LAX bathroom stall. Those bastards! I'm ashamed to be in the same Azeroth with people like this: