Sure I will regret this in the morning but..
There would be no 911 without Israeli abuse of Palestiniians with American and British support. Britain and America have well and truly took the piss. Understaement that and possibly inappropriate but it seems to be history repeating. Don't tackle the real grievences.
Nah I thought 9/11 was supposed to be the result of anger over US troops being stationed in Saudi? Al Quaeda existed partly as a result of the fight against the soviet occupation of Afghanistan and bin laden was particularly upset when US(infidel) troops were deployed in Saudi after the Iraqi invasion of Kuwait.
Granted the support of Israel doesn't win any favours in the arab world but in that instance i don't think it was a big factor or even a factor at all.