I'm going to keep this really simple.
In response to your comment that you could personally "plead guilty" to not having imagined terrorists would use passenger aircraft as weapons→please stop lying.
As proof, I provide the "Iron Man" documents from the Asymmetrical Threats Division of Joint Forces Intelligence Command (JFIC), also known as DO5, whose task it was to track UBL from mid 1998-mid 2001.
I would first note that you were National Security Advisor to the President of the United States -- that means that you had pretty much access to anything and everything available regarding terrorist threats from groups like Al Qaeda.
Fourteen years later, everyone now knows about the summer of 2001 and the more than one dozen intelligence reports blinking red about an impending Al Qaeda terrorist attack. There was the August 6 PDB, FAA reports, CIA reports, DoD reports, and FBI reports -- all indicating and discussing terrorist cells inside the US planning attacks inside the US.
What most people don't know about is the smoking gun report from JFIC, DO5.
According to the report written in the summer of 2000: "The WMD Threat to the U.S." (information cut off date 16 July 2000) the briefing slides emphasized that NYC was the most difficult consequence management problem and recommended using NYC as the model for planning/exercises. The oral briefing itself was much more sensitive, indicating that the World Trade Centers #1 and #2 were the most likely buildings to be attacked in the U.S., followed closely by the Pentagon. The briefer indicated that the worst case scenario would be one Tower collapsed onto the other. The possibility of striking the buildings with a plane may have been discussed then -- it was certainly discussed in the Red Cell Analysis leading up to the briefing period. The acting Deputy of DO5 (name redacted), proposed in the Red Cell Analysis that the building could be struck by a jetliner. Discussion followed on contacting World Trade Center security and engineering/architectural staff, but the idea was not further explored because of a command climate discouraging contact with the civilian community.
So please Ms. Rice -- with all due respect -- stand down and stop spouting lies like, "The idea the president of the United States was warned that Al-Qaeda was going to attack the United States and did nothing about it. Really? Do you think any president of the United States, if he had even an inkling there was going to be an attack, they wouldn't have moved heaven and earth to try to stop it?"