Duh. What did YOU do when you first heard the towers were under attack?
You probably tried to get some more information, tried to figure out what the fuck was going on. If you were like me, you turned on the TV, the radio, and your computer.
Bush just sat there, wondering if he'd picked up the wrong day's script. Not decisive leadership, not the response of an active mind.
I'm with Slothrop on this one- check out the footage.