The Bush administrations official story of 9-11 has three basic premises:
The first is that Islamic terrorists, based in Afghanistan, who hate American freedom plotted and executed the attack - an attack which the U.S. government had no prior knowledge of nor any connection to.
The second premise is that in order to wage and win a war on terrorism the US of A must invade Afghanistan, Irak and every other nation harboring, funding or supporting "terrorists" and that a simultaneous suspension of domestic civil liberties is necessary for internal security.
The third basic premise is that the US-government is all good - while theirs is the very personification of evil, the "evil-doers" as President Bush likes to call them.

This is, summarized briefly, the official version of events and what followed. But if we look a little more closely, we have to notice that until today the criminal case of the 9-11 attacks has remained entirely unsolved. Investigations by police and authorities utterly failed, none of the real backers and preparators of these attacks were found, also no hard evidence and no terrorist was captured. In fact, after 2 years  we do not know more than we knew 48 hours after the attacks, when that list of the 19 Hijackers had been published. So the results of the greatest police-inquiry  in history amount to virtually nothing.
 

Full Version of the lecture here

*

Summaries of Broeckers' books on 9/11:

Conspiracies, Conspiracytheories and the Secrets of 9/11 (app. Aug. 2002)

Facts, Forgeries and the Suppressed Evidence of 9/11 (app. July 2003)