As much as I disagree with it, graffiti is an interesting topic. A lot of graffiti proponents fully believe that they are beautifying the environment by making it human, and even continue doing it as the level of effort to bypass the consequences go up. They don't believe it to be an awful thing (though I'm sure some do, plus some have other motivations, plus some are lying to themselves about their motivations, etc, I just mean what they say and do).

I enjoy murals and graffiti art. Taggers who just put their names on walls, however, are a cancer