@ J. Reynolds. absolutely.... Wise and powerful words. Very fitting parallel with JFK assassination. Lets remind that also Oklahoma and London bombings are about 95% sure inside false flag operations. It is dangerous not to publicly reveal and deal with this... yes, 'why' is more important than 'how exactly'.
911 is a let it happen and made it happen inside operation. The purpose is a good nation uniting pretext for wars.
The big problem with this is that it was carried out on American soil, and it involved casualties.
The rest of how Arab anger was stirred up since 1991 against the US is getting into politics already, though.