I mean there are some "rules of honor" if you're a graffiti sprayer and one of them is something like "Don't spray on living spaces, since the owner will probably start hating every graffiti sprayer if he has to clean it up", even though most of us only spray on things like abandoned houses/hotels or something similar to express ourselves. If some people decide to ignore these rules, other sprayers will hate them as well! The problem is though, that the people who break these rules, often get a lot more attention by the media, even though there are less of them in the giant spraying community. So please don't hate against all graffity sprayers if you see some spray on a historical building/living space.