I read The Looming Tower.
Edmonds' claim does track with the Scheuer contradiction (publicly stated concern about Bin Laden while Alec Station protected al Qaeda operatives behind the scenes). The Scheuer contradiction included the NSA and the FBI ITOS as well.
This assertion - that Alec Station "protected" al Qaeda operatives - is erroneous and in contradiction to Scheuer's own statements and complaints. Unless you misinterpret US government's incompetence in following up on the intelligence and lack of aggressiveness at targeting bin Laden as "protection". But that would be an ironic use of the term, not a literal one. Regardless, you're wrong, and in contradiction to the very person you cite.
Scheuer interviewed Steve Coll on Book TV a few months ago. Coll was on to discuss his book The Bin Ladens. At one point in the interview Scheuer said that the public didn't understand that before 9/11 the Saudis protected Bin Laden. This contradicts some publicly stated views of Bin Laden/al Qaeda. One, this is suggestive of state sponsorship. Two, it is contrary to the notion that Bin Laden was an enemy of the Saudi royal family. Three, it cast doubt on the US/Saudi friendship.
During the Afghan wars, bin Laden did indeed function with the consent of the Saudi government, going so far as to deliver money from the Saudi government to the Afghan Mujahadeen, even though bin Laden was primarily known as a self financer. The money and connection to Prince Turki served as an "in" to the world of the Afghan resistance. Turki in turn used bin Laden to recruit Arabs to the Afghan cause. But this is all specific to the Afghan-Soviet conflict. Presuming that any connection beyond that invalidates "the notion that bin Laden was an enemy of the Saudi royal family" is erroneous, and contradicted by established history, some of which was stated by Scheuer and, separately, much of which was published in The Looming Tower. Since you read this book, you'll of course recall the chapter where the relationship between Turki and Osama started to sour over bin Laden's grandoise plan for overthrowing the Yemeni government. You'll also recall that the Saudi government directly ordered him not to meddle in Yemen's affairs, and that he defied them, embarassing the government to the point where Prince Naif demanded his passport to prevent him from travelling outside the country again.
You'll also recall later chapters where his falling out with the Saudi government became complete over the first Gulf war, where bin Laden was in the minority that recognized Saddam Hussein's threat but was angered at the Saudi government's reliance on America's military for protection. Which was in contradiction to bin Laden's desire to raise an army from friends he made during the Afghan wars along with unemployed Saudis.
You'll also recall from your reading that bin Laden openly defied Prince Turki's plans to elevate one of the Afghan warlords to dominance, which indirectly lead to another warlord - the famous Shah Massoud - launching an attack touched off the Afghan civil war. Which made him an open enemy of Prince Turki, as well as someone who through his actions opposed Saudi government policy.
And to top it all off, you must recall the various parts in the book where Osama's antagonism towards the Saudi government for allowing US troops on Saudi "soil" became complete, and he started contemplating a coup to overthrow that government. As well as the parts where the Saudi king was so upset at bin Laden's agitations against the government that he ordered Turki to "bring this man to heel", and had the Interior Ministry order the bin Laden family to cut off support to him.
In light of all these details that were published in Looming Tower, it's a mystery why you would assert that Saudi protection was contrary to the notion that bin Laden was an enemy of the Saudi royal family. The book clearly lays out the path from cooperation to antagonism, and also describes how bin Laden indeed become an enemy of the Saudi government, as well as why. When you read Scheuer, you must realize that his filter is that much of the West misunderstands the Middle East, which is an accurate statement. But your statement - "the public didn't understand that before 9/11, the Saudis protected Bin Laden. This contradicts some publicly stated views..." you fail to realize that this is correcting public misperceptions about the origins of bin Laden. It's not refuting the fact that bin Laden eventually grew to hate and work against the Saudi government.
It sure looks like US intelligence agencies were given orders to back off Saudi linked terrorist organizations. In light of Scheuer's comment this means orders to back off al Qaeda. Scheuer has put forth a few explanations for US conduct. One, he has stated that pre-9/11 capture/kill missions failed due to risk averse policy makers. Two, he stated that CIA withholding about al-Hazmi and al-Mihdhar was due to concern about poor FBI computer systems. Three, as previously mentioned he suggested that al Qaeda was protected by the Saudi government.
The first two statements you cite are clear evidence of incompetence, nto active protection. You said it yourself: "risk averse policy makers". There's nothing conspiratorial about that.
And any suggestions that al Qaeda is protected by the Saudi government fail in the light of that government being a stated target of the group. Furthermore, the Saudis have demonstrated that they're willing to obstruct outside assistance in order to pursue their own justice, as demonstrated in the case of the culprits in the Khobar Towers bombings. They obstructed US investigations only to execute 4 culprits through their own system. You cannot confuse that with open protection.
I don't consider myself a "truther." I do consider myself a skeptic of official explanations. Where is the 9/11 transparency from the government? If skeptics are so full of it then why is there so much secrecy almost eight years after the attacks?
The real question is why, if all you are is a skeptic asking questions, are you merely reiterating standard conspiracy peddling claims? An also, why you fail to comprehend primary and secondary information, and instead trust the spinning of facts by conspiracy peddlers over truly independent analysis? The fact of the matter is that truly undecided researchers research the primary information and take pains to understand the depth of the story, instead of merely retailing conspiratorial myths. You have demonstrated a propensity to favor conspiracy myths. So you may believe that you're no truther, but your actions demonstrate otherwise.