If I had to bet, if any of the well-heeled Saudis who helped actually knew these guys intended to hijack planes, much less kamikaze them into buildings, they’d have run the other way, and hard. They certainly knew what they were doing was illegal, and “sneaky”, but that’s also 90% of how life is lived over there.
My gut feeling on this that it was more about “helping” OBL and AQ for how it played out back in the internal politics and royal politics of Saudi Arabia. I doubt they understood or knew what 9/11 was going to be. These were people too far removed from the influence or graft from the House of Saud, doing what they could to curry favor with the next set of “cool kids” in upper echelon Saudi Life.
So in that sense, I think they were “used”, and would have never touched it, or the 12 hijackers, if only for selfish reasons of self-preservation if they understood that the 12 hijackers were “for real” and not just “play terrorists” jockeying for hardliner cred and the money and life abroad it could bring them. Congress and the Admin didn’t want the war drumbeat focusing on Saudi Arabia for a whole slew of political and economic reasons, and especially when the folks involved probably didn’t actually “want” 9/11, despite the aid they gave to its ultimate execution.
I agree, the whole place is an execrable pit, partly screwed up by the British, but mostly by the religion and culture of the region. And why we should use nuclear at least as much as the French do.