The confessions of Khalid Sheikh Mohammed (wiki) of his responsibility of masterminding the attacks of 9/11 (among other crimes) should put to rest any doubts our people have about this plot. I think we should accept responsibility for having a system to produce these evil minds.
At least 50% of any group I discuss the events of 9/11 with would suspect that the real story wasn't told, and that these infamous 19 murderers were not the true killers on that date. Some would compromise by admitting that these are the true killers, but someone else mislead them (of course the usual culprits in Arab minds...).
The excellent reporter Yousri Fouda, presented numerous programs describing how Al-Qaeda was able to pull-off the 9/11 attacks, such as here where he discusses with a panel of experts the details of the plot, and here where Bin Laden brags about his knowledge of the origins of each of the 19 hijackers. He also had a one on one interview with Sheikh Mohamed shortly before his arrest in Pakistan, however the transcript of this program seems to have been removed from Al-Jazeera site.
I think it is about time to believe that there are no cover-ups, and that we should do something about our education system to prevent this system from producing such criminals.