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Now this is the sort of graffiti that I wholeheartedly endorse, and encourage.  An automated camera and rapid fire paint ball gun, connected to a computer program that does hand writing recognition should be mounted across the street as well.  If a miscreant signs illegibly, the program targets the little boy with the paint ball gun, and sprays him repeatedly, to "mark" him.  Paint ball gun across the street... or maybe cat urine in a bucket mounted on the roof's edge high above the wall... either one would work I think.