Earlier Brownie said something to the effect that in Homeland Security there's basically a segment oriented towards dealing with terrorism and a segment oriented towards dealing with national disasters and the former doesn't really give a shit about the latter. He then went on to say that if terrorists had blown up the levees in New Orleans there certainly would've been a much better response than there was.
This, really, gets to the central point. Dealing with the aftermath of a terrorist attack is pretty much exactly like dealing with a major national disaster. It's the precisely the same thing from that perspective. For what possible reason would one cause of death and chaos invite a greater emergency response than another?