"if we fly it one day for each of the American victims" - I assume that means September 11th (by no means all those killed were Americans).

I don't think anyone would suggest that the people killed in that wedding party had anything to do with the who killing on September 11th. I think it would have been a good gesture when something terrible is done on the eve of July 4th.

If noone actually did take their flag down to half mast, I'd be a bit surprised really.