They are called "ThinkTanks". They are supposed to "imagine" scenarios of potential threats to the United States and derive solutions. Had George W. Bush employed think tanks that took middle eastern terrorism a bit more seriously or listened to the advice of the few that were, perhaps 9/11 could have been avoided.
9/11 was planned long before Bush ever took office and was in motion long before he became President. What you must have meant is if Clinton had taken the Middle East seriously.
Or are you claiming the 9/11 terrorists did not start planning until Bush was elected and did not start assembling training and intel gathering till he was in office?
Ohh and be specific what policy or policies did Bush implement between Jan 2001 and September 11 2001 that caused the attack?