If this doofus has to ask (whether rhetorically or literally) what we are celebrating, then he's not the kind of American worth sacrificing a single soldier's life for.
It is so terribly ironic that a schmuck like this can say dreadful things about the United States while our soldiers are defending his right to say such dreadful things. How dare he!
SOB, if he doesn't like it here, well, he ought to leave, go to Canada and get it over with - once an for all.
Phew. Feel better now.