Haha, yeah, I always found that ironic. Hardcore heartland conservatives who absolutely hate liberal cities like New York and everything they stand for have cried about 9/11 louder and longer than anyone from the region that was victim to it did.
I didn't see anything in that routine that spoke to the twin towere attack despite it being a pretty great display of skills. Looks like they made the poor choice of the Lee Greenwood cut that was done with overdubs of tragedy talk. This is less about cheerleaders exploiting an event about as old as they are as it was Greenwood trying to stretch his one hit.