Many years ago I developed Playing Card set of those I thought were responsible for 9-11. Please check it out. 10 years many of us researched the daylights out of the 9-11 smoke and haze. The authorities were completely co-opted by either money, blackmail, threats, promotions, or other influences including not wanting to be called incompetent for their inactions.
I never got a chance to finish it but you should be able to gain enough info about the prime suspects.
The first link is for the card set, the second and third links are for the backup summary data on the suspects.