Graffiti is not art, it's vandalism!
I hear people all the time try to excuse graffiti as art. But the truth is that it's vandalism and destruction of other people's property. Someone may like graffiti and consider it an art form. And they try to use the definition of art to excuse it. But those people are missing a major point about what art is. Art is created by commission or on the property the owner wants the art made on. Most graffiti is done without the consent or permission of the owner of which the graffiti appears on. The graffiti "artists" go where ever they want and destroy other people's property. I wouldn't want someone to tag up may walls of my building, just because it's their "self-expression"... If I asked them to do so, then it's a different story. Why doesn't the graffiti "artists" do their work on canvas? Why do they need to tag public property? Self-expression isn't about destruction, it's about creation. Graffiti destroys. Go create graffiti and display it in a museum or an art show.