That was the problem with 9/11, hard to pin down the guilty parties. The Saudi regime most certainly did not participate, approve, etc. Some Saudi nationals, including royal family, did (the Saudis actually cleaned their own house in those cases). Bearing in mind that there are thousands of royal family members, many of which have too much time and money on their hands.


But the discussion was about a hypothetical 9/11 scale event perpetrated by a nation-state.