Sacred to whom?
Special to thousands of people, but sacred? No. It is very unlikely that it was ever sacred. It's just a fkoff big land marker. Actually it's a beautiful symbol of oppression of the masses by a tyrant overlord and a war-mongering one at that! Shit! When I put it like that I wonder why I've never defaced it!
I do agree that it is a deplorable thing to do and for a 'kin disgusting cause, but I think playing the "But it's sacred!" card is a little unnecessary (and probably wya off the mark). Just "But it's 2500 years old!" is enough surely.