What about experimental graffiti abatement programs? Do these programs work?

So called "free walls, graffiti walls, graffiti zones," etc. have failed to correct the vandalism communities have experienced. Once the vandals had a place to paint, vandalism in the immediate area of the walls increased 300 percent. Graffiti zones do not work. Graffiti zones attract trouble. Despite the obvious failure of the vandals to adhere to community agreements, this city still stands accused of artistic censorship by graffiti advocates! Go figure!