I like graffiti, really I do - if they are good graffiti of course. And I can't quite see why good graffiti should be illegal. They make cities look so much more like they were 'lived in', if you get what I mean.
Bad graffiti though, that's a different matter altogether. Like that one:
Graffiti of that style and quality really should not only be forbidden but prosecuted. Heads off of that bad graffiti writers, is what I say! The Queen of Hearts of Alice's Wonderland surely would have done those away long since.