The Saudi connection to 9/11 was and still is covered up, being redacted from all the American intelligence reports released to the public. The bin laden family was whisked away to safety out of the country before any investigation had taken place and while all american commercial passenger flights were grounded.
And now we see that the Bin Laden family are a major corporate giant playing a large role for the Saudi Government in its construction efforts at its national sites.
Some pretty clear math here.