I don't understand your point. Defend WHAT decision? Signing the legislation that set up the commision? Or are you talking about the 1 hour limitation?
I think it's real simple. Bush was in office less than 9 months when 9/11 happened. His FBI director had only been confirmed by Congress a few days before the event.
There were NO precursors, such as warnings, threats or similar attacks since Bush took office that would lead anyone to think that a specific act was immenent.
There was no hand off from the previous administration of intelligence indicating that Islamic terrorists were a specific threat against the continental US, just general information, and that almost entirely pointed to attacks overseas. In fact, the Clintonistas (and Kerry now) view terrorism as a law enforcement issue, not a military or intelligence issue. The Clinton Justice Department, and Clinton himself, made it very clear that they viewed "right wing Christians" and "right wing anti-Castro forces" and "gun nuts" as the real terrorist threats to the US.
Given all of this it is apparent that the press or the dims asking for more than an hour of this President's time is because they are grandstanding and trying to make partisan points.
If they want to know why 9/11 happened they need to spend their time with Clinton, Gore, Reno and mad Maddy Albright and find out what went on the 8 years they were in charge. They need to rake Church Commission members and their cheering section over the coals and demand they justify their actions and the blood on their hands. They need to confront Jimmy Carter and ask why he signed the laws that made it illegal for the CIA and the FBI to share information.
Anyone who wants to spend more than an hour with Bush or Cheney and hasn't already spent years digging into these things isn't interested in the truth.