TLDR version: The terrorists won.
Why would I say that? Let me begin by saying this is a spectacular book. One of the blurbs says it's the best book written by a committee since the King James Bible, and I'm willing to bet that's true. The "house style" adopted by the committee is fresh and simple, accessible. Part of the reason the terrorists win is because, frankly, this book was supposed to be read by every conscientious participant in our alleged democracy. Republic. Whatever. Reading the lessons and recommendations from this commission, I can guess that most people haven't even seen this book in the bookstore. No matter how good the house style is, this is a book that was in vogue around 2004 when it was published and hasn't been read, or much thought about, since.
Some of the perspective of this book is downright frightening. While the commission admits that it couldn't find out everything, it was able to reconstruct an incredibly detailed narrative. Seeing the lives and actions of the hijackers did not come as a comfort to me; I found it disturbing that the daily lives could be inferred so well. By logical extension, that means *anyone's* life can be reconstructed by the government with such particular detail. After all, while many of these hijackers were being watched, nobody was exactly sure what they were doing. Intel gathers much, much more information than it analyzes. It felt uncanny to read about the lives of these fanatics, as if I could almost see my own life from the government's eyes. That is creepy and wrong. I get that a) I am ostensibly nothing like these dudes and b) the reader isn't supposed to empathize with these characters. Coming from a literary perspective, though....
Lastly and most importantly, however, the terrorists win because they have achieved their objectives. Was their objective to overcome the United States by force? No. They had/have insufficient forces, vehicles, and technology to launch anything remotely like an invasion. They are not a conventional army. Their tactics are psychological. The goal is to create an atmosphere of fear and uncertainty that undermines our political system. The PATRIOT Act did a good job of rewriting the domestic rules of our freedom. Do the terrorists hate us for our freedoms? Hardly. Different cultures have a different idea of freedoms to begin with, and our ideas are as unintelligible to them as theirs are to us - FFS, the ideas of freedoms between democrats and republicans are hardly intelligible. So. All this about security, about "making America safe again," about restoring law and order, about empowering our police, it's by and large a reaction to 9/11. The commission talks about overseas strategies, revamping the intel community, working with Muslim allies. But all the foreign policy stuff got chucked out the window once ISIS started executing attacks on the regular.
The hawks are winning. They *will* win. There's too much support for taking the fight to the enemy, even if it costs us everything we stand for. Slowly, this war will turn America into something it has long been in danger of becoming. When you play into the enemy's hands, they win. The commission saw that - nobody else seems to be conscious of the fact. But fear is powerful, and today fear spreads like never before.
This book truly marks a phase change.