Imagine yourself back in 2003 or so...and you have learned your government could have attacked itself? Certainly, this was not a possibility for almost anyone at the time, and even now many don't believe it could have happened. Nationalistic fervor is a very powerful thing, tapping into deep instincts like tribalism. Cognitive dissonance also comes into play because the act of attacking ones own people is so heinous and immoral as to defy belief!
It is for this reason Architects and Engineers for 9/11 Truth ( ae911truth.org ) is so important. This is a group of professionals who don't believe the official story of what we are told happened that day. These people are putting their reputations on the line to say the physics does not match the story. I find their testimony and evidence to be very compelling. Importantly, normal folks have more trust in someone who can provide credibility and data to back up their position.
I had the pleasure of taking a mountain biking trip in Colorado a few years later, and picked up a copy of The Confessions of an Economic Hit Man, by John Perkins to take with me. This book was an examination of how the US government and major corporations are (and have been for a very long time) using "consultants" to extort, bribe and even topple leaders in an attempt to extract resources around the world. In about three weeks, I learned of the nature of the power structure of the world as it relates to social changes we see throughout history. In other words, I learned how the world really works.
So, where do we go from here? Clearly there is a fundamental flaw in the concept that our government is representing its people. Instead, the government is acting in the interest and on the behalf of large corporations.