You make some good points. One can only fill a given area with so many people. Crowd estimates for one thing always to seem disproportionate to what in reality show up.
Today I had a fellow marine Veteran suggest to me that the best thing to do is let them deface the wall.
His reasoning is that it will prove just how anti American these people really are, just like Piss Christ proved how anti Christian they are.
He could be right, but I for one don't want to find out if he is.
Do you?