Ifølge Gallup Poll i 2006 så mente 7% av Muslimer at 9/11 kunne rettferdiggjøres. Dette var tatt utifra 10 land. Undersøkelsen konkluderte at disse radikale Muslimene var over gjennomsnittet mer utdannet enn de mer moderate Muslimene. (Dalia Mogahed, executive director for Gallup's Center for Muslim Studies, "The Battle for Hearts and Minds: Moderate vs. Extermist Views in the Muslim World," Gallup 2006.
Så rundt 100 millioner Muslimer mener at 9/11 kunne rettferdiggjøres. Fareed Zakaria fra CNN sa, "The problem is not that Osama Bin Laden believes that this is a religious war against America. It's that millions of people across the Islamic world seems to agree. (Fareed Zakaria, "Why do they hate us?" Newsweek, October 15, 2001).