Oil
Again, we are sorry for all the political statements being made here, but when it comes to graffiti and vandalism, that just comes with the territory, they can not help themselves. When they see a sign on the street that has not been touched, they need to be the first ones there.
We feel like each of them has an urge inside of them, they need to mark their territory before other street vandals get there. Okay, so we are making them sound more like wolves and not like human beings, but we think you get the point. All those newly posted signs better watch out.