Center for American Progress makes a valid point:

In his single-minded push to go to war in Iraq, President Bush defended his lack of definitive proof of a WMD threat by saying, "Some have said we must not act until the threat is imminent. Since when have terrorists and tyrants announced their intentions, politely putting us on notice before they strike? If this threat is permitted to fully and suddenly emerge, all actions, all words, and all recriminations would come too late." However, he used exactly the opposite rationale to justify why he ignored far more compelling evidence about the terrorist threat leading up to 9/11. Despite explicit warnings that al Qaeda might be planning attacks inside the United States, he said, "There was nothing in [the PDB] that said, you know, there's an imminent attack. There was nothing in this report to me that said, oh, by the way, we've got intelligence that says something is about to happen in America."

They didn't tell me the date, time and place of the attack, so I'm just going to ignore this whole thing until something happens. But, that man tried to hurt my daddy, so I'm going to invade, unprovoked, his country and kill thousands of his citizens.