Artful Dodger: Good post with solid reasoning. I will re-phrase to say: I have seen enough evidence that, although I don't know all details of the plot, I am convinced that 9/11 was orchestrated & carried out by elements within the U.S. Government. And I believe that, were this evidence presented in a court of law, an impartial jury would arrive at the same conclusion.

Still, as you correctly say, many questions still do need to be answered, and many mysteries remain. An independent official investigative committee with subpoena power is needed, but unlikely to develop. Because of this lack, our best-case scenario for understanding 9/11, at the moment, seems to be more-or-less private investigation, piecing together of facts through newspaper reports, etc., and the general spreading of knowledge & information through unofficial sources.

Any investigation, official or unofficial, also needs to be scrutinized, both its results & its methods of arriving at them. No easy task, to be sure.