Let's review a few facts, more or less agreed upon by both sides. (Anyone who even remotely understands physics can see that the 3 buildings on 9/11 did not collapse due to fire and gravity, but I will skip that part for now.)
1. Before 9/11, no tall building had ever collapsed due to fire. Then, miraculously, 3 on the same day according to NIST.
2. The temperatures at ground zero were higher than what you would get from jet fuel and office fires. The fires burned for 3 months, hot enough to melt steel.
3. The collapse of WTC 7 was known before it happened. Firefighters cleared the area. There are firefighters on record saying that the building was going to be brought down.
4. NORAD is supposed to maintain air sovereignty over the U.S. and Canada, to detect things like enemy intercontinental ballistic missiles and fighter aircraft. Yet on 9/11, it was unable to track an American made commercial aircraft, taking off from an American airport, and crashing into the headquarters of the American military -- almost a full hour after planes had already crashed into the WTC towers. As a result of this glaring incompetence, no one was fired or even reprimanded.
5. The only available video evidence of the Pentagon attack is several frames of an inconclusive white streak going into the facade of the building. All other video evidence has been seized by the FBI.
6. There is no visible evidence of a plane crashing at the Shanksville site.
7. There was a preponderance of military drills held on 9/11, that eerily resembled the actual attacks.
Now, people on the side of the establishment say that the burden of proof lies with conspiracy theorists to prove the government is lying. How did we end up being such weak-minded zombies? The government (whatever that is) used 9/11 to start two wars, to kidnap and torture, to shred the legal system and constitution. It used 9/11 as carte blanche to do whatever it wanted in the name of national security. The burden of proof was on them, not us.
They played on our arrogance and fear. We take pride in being the fortunate people of the earth, and we think we are special because we are Americans. We took the bait, hook, line and sinker.