I just cant buy it. Our Government cant balance a check book, or manage a credit card, but they can pull this off ?
You seem to be viewing the government as just one big entity and ignoring the many tentacles that are attached to it and the compartmentalization of the departments, and even within the agencies/departments themselves.
Not to mention the backgrounds and loyalties of some of those within the government branches that most certainly could facilitate any number of things and outcomes.
You also rather naively dismiss the real threat of bribery, and political and physical death and financial ruin after years of "hard work" that are at stake.
Perhaps you might do well to brush up on the machinations of government and history before you involve yourself in a 9-11 conspiracy discussion.
A good place to start would be what some of the whistle blowers and those in the fields pertinent to government and the 9-11 attacks have said regarding their objections to the the official version of events, followed by the objections of credible people in science and physics pertaining to the destruction of the WTC buildings.
There are many who do not have some sort of dependence on government, financially or otherwise.
Skipping all the way to the who, why, and how is going to make you ignore the very first and important reason there was almost immediate doubt the truth was being told in the first place.
Not knowing those 3 parts does not in anyway dismiss the physics and science behind the 9-11 events, or the improbability of the NIST report being accurate, or scientifically sound..