"First of all, the point is, they weren't even held for more than perfunctory questioning."
How do you actually know it was perfunctory? Ok, let's say Mary Anne is in charge. How would you do it?

"Second, they were allowed to fly around in special airplanes on days when planes carrying freaking donated organs for transplants were grounded."
So what your point?
How are donated organs usually flown- commerical flights? They probably would have a high priority on commerical flights. No, commerical flights- no organs flown. Probably wouldn't make much sense to routinely fly organs on miltary flights. Though I guess that the Saudis were flown on miltary flights. It seems to be that this is mostly a problem with dealing with govt bureaucracies. I would guess that organs are a commerical business. I would guess that there are rules against using miltary flights for any commerical business. That's how bureaucracies work- good or logic isn't important, it is what the laws or regs allow.
You can't say this is the President's fault, he didn't have the choice of picking between organs being flown or Saudis being flown. Basically it's an augument that Saudis were given special treatment. I think the Saudi should have been something the State dept should have focused it's attention on. I'm sure the State dept can easily arrange with the miltary, a miltary flight- anyone in the miltary could probably fiqure out how to get this done. If the organ shipper had the proper contact with the miltary and there happen to be a miltary flight going at right time and destination, then the organ donor *might* have been able to hike a ride.
I'm just guessing- you got any specific info?

"Third, you stated that we would want to land our military in another country to defend Americans from the locals in the event that Americans committed an atrocity in a foreign land. Doyyy. It only works that way in Westerns. (It's not unreasonable to expect a nation to take some care of its foreign visitors in extreme circumstances.)"

Keyword is "want", not "would". We would "want" if we couldn't get assurances that Americans would be adequately protected.
I'm sure State dept would have assured the Saudi govt that it was taking adequate measures to ensure these people were protected.
And this is not something done only in Westerns.

"Fourth, why were people with possible connections given a buy while others without connections got thrown in lockup for weeks and months?"

I don't know, I would need some details. But as a wild guess, is it because Bush is EVIL?

"Fifth, no one said they had committed any crime whatsoever. It is good police practice to keep people who may be material witnesses from leaving the country during the investigation until such time as they have been thoroughly interviewed. "

Ok, but why do you suspect these family members were material witnesses? Do you think it's logical, if they had knowledge about 911 that they would be in America?
And if they don't offer any information, how are you going to get this information? Do you think they wouldn't think of getting a lawyer? Would you deny them this right? What would a lawyer tell you?

"Sixth, it wasn't up to the Saudis to call the shots. 911 was an offense against American law that killed American citizens and guests and detroyed American property. Their citizens committed the crimes, and one of the masterminds had family in this country that may have had important information. But instead of holding them and questioning them carefully, they flew away. Why?"

I think that OLB had a pool of people he could choose from, and I think he deliberately chose people from Saudi Arabia.
I think it's reasonable that OLB would want to damage the US/Saudi relationship. I think he also liked the symbolism.