Trump told CNN on Tuesday, “George Tenet, the CIA Director, knew in advance that there would be an attack, and he said so to the president.”
Plus there were low level agents screaming at their higher ups that something was going on only to be squelched because they didn’t want the bad PR should they be wrong, ie. allegations of islamophobia etc....
And the Bush/Saudi connection didn’t help matters much either....
Imagine if an agent arrested a Saudi student going to one of those flight schools before 9/11, one call to their rich 3rd cousin oil Shiek over there in the kingdom who was friends with their inbred king and they would probably be fired within the week.
Your mistake is trying to link al Qaeda conspirators to the Government (the Saudi Monarchy), they were trying to over-throw. bin Laden’s was to the Monarchy in Arabia, what Lenin & Trotsky were to the Czars.