AOG, look at American foreign policy and the regimes it's supported, then you begin to understand 9/11.
Terrorists and 9/11 were not created in a vacuum.
When you look at Noriega, Pinochet, Batista and Galtieri, when you look at it's support of the Nicaraguan contras, Israel and the recent attempted coup in Venezuela, then you begin to realise that there is a wealth of world opinion that differs from the U.S, that is, was and will always be suppressed by U.S foreign policy and it's attendant corporations.
They don't have cruise missiles that can strike from 100s of miles away, they don't have I.C.B.Ms, they don't have heavy armour or artillery, they don't have massive news corporations on their payroll to show their dead and dying, all they've got is Al-Jazeera, whose journalists the U.S have killed many times.
None of this condones 9/11 but helps explain it, when we accept that foreigners have a right to freedom, and to disagree with us, when we accept that Palestinian children have as much right to life as ours, we'll make progress towards peace.
It won't come via torture, war or violent suppression.