When I visited the JFK memorial in Dallas there were all sorts of vandalism, the worst I saw beside the graffiti was the human excrement that was purposely piled on the epitaph. I went there to pay by respect but left disgusted, I returned one week later because my trip was ending to see the memorial again and sure enough no one bothered to clean it up and there was even more excrement on the epitaph.
Disgusting. Is that a Federal monument or local? Someone should clean it up and try to prevent it from happening. Maybe surveillance cameras are a possible solution.