You're right, however, why shouldn't we strive to have as much of the record as possible? Should we, in regards to 9/11, be happy with what we've got now?
Now let's try this again.
Let's go back to your analogy to the novel. You said having only a certain percentage of the available record is like having a book with the final three chapters missing. The insinuation is that you'd have the beginning and the middle of the story, but not the end. But as others pointed out, that's not the only way you can chop three chapters' worth of material out of a book.
In fact, we routinely do it the other way when we write books or make movies. After the story is told, an editor comes in and pares away that which is not necessary. If you remove the equivalent three or four paragraphs from each chapter, you end up with a shorter book than you once had, but not one that fails to tell the story.
Now obviously such a conscious and deliberate editorial process is not the main reason we don't often have all the information for some historical occurrence. Happenstance events don't leave tidy evidence trails. And of course the elephant in the room is the protection of privileged information. Since there are legitimate reasons for redactions, assuming it's done to alter the story is the fallacy of affirming the consequent.
No one, including me, has said we shouldn't strive to have as much of the record as possible for any historical even in which we are interested. That isn't the issue. The issue is whether it's reasonable to expect ever to have
all of it. Since it isn't, the curiosity that drives the search for more information has to be tempered. If it isn't, the resulting anxiety drives unproductive speculation to fill the gap with ... whatever. LIHOP, nanothermite, missiles.
When skeptics (or at least I) say they're comfortable in this way, it doesn't mean they lack curiosity. It means they're content to wait until that curiosity can be satisfied properly, without anxiety or wanton speculation. And they've reconciled with the likelihood that some curiosity will never be satisfied. Our capacity to generate questions pertinent to a happenstance event will always far outstrip our ability to collect information to answer them. And conspiracism has become adept at generating unanswerable questions that seem very important without actually being so.
Then skeptics (or at least I) can go on to say they're comfortable that the level of information now in our possession supports a conclusion. That's not giving up. That's not apathy. That's not a lack of curiosity. It's simply a subjective opinion that the outstanding information is unlikely to change any of the prevailing story's broad strokes. Stated simply, the skeptic is willing at a certain point to make the inductive leap. In the 9/11 case, it's a tentative vote that after more than a decade of study, what remains undiscovered isn't likely to materially alter the prevailing timeline, assign new guilt, or exonerate the nominal terrorists.
No one, including me, has advocated that drawing a conclusion is akin digging a trench and staying in it forever, as critics of skeptics are wont to claim. The inductive leap is taken only until more information becomes available for evaluation, on the basis that objectively a lot is already known. Comfort with the information in hand is not necessarily the same as satisfaction that it answers the question conclusively, without any possibility of amendment. It's simply a willingness not to freak out until new information becomes available. Conspiracists think that speculation and handwaving ought to be enough to invalidate an inductive leap. Much of the skeptic's objection to that is what gets misinterpreted as entrenchment.
There's some precedent for making that leap. There was a 25-year moratorium on publishing the Kennedy autopsy photos. When the world finally got to see the head wound up close, they discovered it was largely as the witnesses had described. The Apollo astronaut debriefings were classified for 25 years, leading to speculation they recorded discussions of aliens or fakery. When they were finally published, none of the books on Apollo needed to be rewritten. There are separate threads here for debating those points; I cite them here only as examples.
Even when it was subsequently revealed that
USS Vincennes shot down an Iranian airliner from within Iran's territorial waters (not international waters, as the Navy initially claimed), the resulting hand-wringing didn't last long or add all that much to the pile of condemnation already heaped upon the Navy, nor the liability the U.S. already accepted for the incident. In other words, it didn't materially change the existing story. I mention that because I think it's an excellent example of the kind of information guilty parties would try to hide if they could, the kind of information you generally allude to when you speak of trying to uncover it and hold people responsible, and the kind of information that periodically comes to light in our study of history. The skeptic's rejoinder is that this is what it takes to turn a conspiracy theory into an actual conspiracy.
You're the one who insisted that 100% revelation was the acceptable level of comfort. You're the one who once said government should not be allowed to keep any secrets whatsoever. I need to impress upon you that
these are the irrational positions, not ours. If you want to retreat from them, fine. But then say that's what you're doing, and give your critics their due.
I believe a more rational approach is that 20-odd pages of redacted documents, amid the entire body of 9/11 evidence, is not going to materially alter or add to the prevailing understanding of what happened. Since others have seen it and pronounce it unremarkable, I'm comfortable in that conclusion.
As I've said many times, your arguments on practically any subject in this forum always boil down to the same flawed proposition: that if any information is unavailable, you are justified in believing the story would be substantially different were it revealed. The response you keep getting is a concerted judgment that the inductive gap is simply not big enough in all these cases to fit all the conceivable anxieties and speculations that are being crammed into it.
You're not the first or only conspiracy theorist to use this argument. It's fairly common. You're not even the first to try the "FOIA requests get us nowhere," argument. "We don't have 100% of the information, and you should all be ashamed of yourselves for drawing a conclusion without it," is pretty much a yawner, for the reasons we've given you abundantly.