Oh, HELL no.
This is offensive on so many levels: Antiwar protestors trash 9/11 memorial. [Link via Juan Gato.] Warning to anti-war activist types: if you approach my private property with intent to "express yourself" via some kind of vandalism, I will express myself in return, and we're going to be doing the three-legged race to the hospital to have my foot removed from your ass. Period.