as for believing everything you get told, perhaps those of you who are still seduced by the wonder of the conspiracy theories might do yourselves a favour and read the book published by popular mechanics, entitled "Debunking 9/11".
it is more a thinking mans approach to understanding what happened, using empirical data and scientific evidence as opposed to heresay and other impressions clouded by the fog of war.
i think you'll find the planes make a hell of a lot more sense than any other option.