Okay no worries I'd rather have assumed you didn't know than not tell.
I think there was the FBI field guy who informed months before the event about groups of men taking flight training to his superiors who then proceeded to do nothing with the information. He left over it and scored the position as head of security at world trade center and it was his first day at work when the planes hit, that coincidence is amazing. Plus other failures of communication betwen agencies.
So yes the why? It can't be just negligence by so many at the top but either a willingness to allow it happen or a complicity/conspiracy in the event. I doubt bush new anything much prior to the event but he would have been keyed in on things once the situation was rolling and he was the one who put forth everything that went on after it.Interestingly Bush's actions followed the events required and described in a book released a few yearts prior to the 911 attack.
The book is called The Grand Chessboard and it lays out almost exactly the events that led up to 911 and the events after the event. It was released in 1998 by Zbigniew Brezinski, Mika's father (the blonde woman on NBC? morning joe). If this book doesn't also suggest it was planned from within then I don't know what else can. It's virtually the timetable of events and it describes the attack required as a "New Pearl Harbour Event".
So to you would you describe the World Trade center attacks as a New Pearl Harbour event?