Fifteen of the hijackers were from Saudi Arabia, two from the United Arab Emirates, one from Egypt, and one from Lebanon.[80] Mohamed Atta, also from Egypt, was the ringleader of the 19 hijackers.[81] According to Jerrold Post, a professor of psychology at George Washington University and former CIA officer, the hijackers were well-educated, mature adults, whose belief systems were fully formed.
From Wiki
Being educated doeent mean being clever all round,if they knew any better they would have just planted bomb to planet more another day, killing yourself is a waste.
