I mean "terrorism is bad and some terrorists are muslims, and the ones who hit this particular spot were muslims"

and

"not all muslims are terrorists, and these particular muslims are citizens of this country and just as much affected by the moron muslims who are terrorists as we are, if not more so".

Muslims don't have any responsibility to be "sensitive" about 9/11 for the simple reason that they are not tied to it.