The main cause for any tragic incident such as the attack on the WTC and the pentagon is religion. Not just Islam, but any religion in general. There are still sick fucks in Ireland who are christian extremest. There are still psycos in America who believe in bombing abortian clinics, for God's will. Even during the Crusades, christian soldiers believed that all there sins would be forgiven and would be let into heaven, if they fought in the war. So things like this will always be around, as long as religion is here. But this could of been prevented if the U.S had better Airport security, ect... When I was living in Frankfurt, I remember if you left a bag unattanded, that the police would rush over, machine guns in hand, and take it outside and blow it up, without even inspecting what was inside of it. And I am prety sure that you were not allowed to bring knives and box cutters on to the aircraft, and they inspected you more. There are several things to blame, but I believe that the lack of airport security in the United States is the #1 thing to blame, not Islam.