Questions on 9/11

File: haunting.jpg (227KB, 1925x1444px) Image search: [Google]

227KB, 1925x1444px

What really caused 9/11 ?
From what I understand, 15 Saudis, 2 Emiratis, 1 Lebanese & 1 Egyptian from Al Qaeda managed to destroy the World Trade Center by hijacking airplaines.
The reasons were :
>The presence of the US troops in Saudi Arabia
"for over seven years the United States has been occupying the lands of Islam in the holiest of places, the Arabian Peninsula, plundering its riches, dictating to its rulers, humiliating its people, terrorizing its neighbors, and turning its bases in the Peninsula into a spearhead through which to fight the neighboring Muslim peoples." - fatwa from Al Qaeda

>The sanction imposed on Iraq
"despite the great devastation inflicted on the Iraqi people by the crusader-Zionist alliance, and despite the huge number of those killed, which has exceeded 1 million... despite all this, the Americans are once against trying to repeat the horrific massacres, as though they are not content with the protracted blockade imposed after the ferocious war or the fragmentation and devastation..." - fatwa from Al Qaeda

>Support of the Jewish State Israel
"The aim [of the United States] is also to serve the Jews' petty state and divert attention from its occupation of Jerusalem and murder of Muslims there. The best proof of this is their eagerness to destroy Iraq, the strongest neighboring Arab state, and their endeavor to fragment all the states of the region such as Iraq, Saudi Arabia, Egypt, and Sudan into paper statelets and through their disunion and weakness to guarantee Israel's survival and the continuation of the brutal crusade occupation of the Peninsula." - Osama ben Laden

Were these the only reasons? What I don't understand is how could these Arabs who are supposed to have a mean IQ of 85, managed to hijack two planes and crush them into the Twin Towers??

Do you think that the US should leave entirely the Middle East ?