I haven�t seen any of these documentaries ( I will now) but I have always believed that media makes up you mind. In marketing they use a phrase people buy what they see or hear about. How would you believe or even not believe in something that you have never heard, seen, felt and so on.
About Al Qaeeda, my own perception has always been that these people (top leadership) are American agents and are working to give Americans excuse to invade countries. Name itself is like miscellaneous account where anyone who does not agree about the supremacy of USA would be added.
Then comes the real and unimagined problem. Those people who already had hate against double standards of the West and USA, were disappointed with their appointed leadership of the countries and saw face of Hero among Alqaeeda leadership who decided to take this problem beyond simple protests and meaning less resolutions. These people are neither American agents, nor in the control of America or even known Al Qaeeda. So in few words it is a wrong strategy of USA that is back firing and the whole world is suffering.