I'm not American, but I doubt being pro-graffiti is a universal American value. I suspect many Americans aren't that into it, given it makes the place look bad. Many Americans might think instead that you should only deface things you own.
I think it makes the place look like a place where people are free and not oppressed, which is nice.
I think it makes the place look like a place where people are free and not oppressed, which is nice.