1) If the United States government was actually behind 9/11, hundreds, thousands, and maybe even ten thousands of people would have to be involved. Do you really believe that many Americans would stay quiet about the murder of 3,000 citizens by our own government?
2) Some Truthers believe a car bomb or a missile hit the Pentagon instead of a plane. So how do they explain the witnesses, like James Robbins, who saw a plane hit the Pentagon?
3) If neither the WTC nor the Pentagon was hit by a plane (and, yes, there are Truthers who believe that), what happened to all the people on the planes?
4) Osama Bin Laden publicly admitted that Al-Qaeda was behind the attacks. How do you explain that if our own government is really behind the attacks?
5) "The 9/11 attacks, or at least parts of those attacks, have been investigated by the 9/11 commission, the CIA, FBI, FAA, FEMA, The National Institute of Standards and Technology, the Senate Select Committee on Intelligence, (and) the House Permanent Select Committee on Intelligence." None of these groups concluded the U.S. government was behind the attacks. So, were they all in on it or are they simply not privy to the same inside information that Alex Jones has?
6) Bizarrely, despite the fact that the WTC was hit by planes, many Truthers claim the buildings were brought down by controlled demolitions. How in the world could that be done without people in the buildings noticing it? Why in the world would they wire the buildings with explosives and THEN fly planes into the buildings? It's not as if terrorists hadn't ever tried to bring down a building with bombs before.
7) Certainly if there was a government conspiracy to target the WTC and Pentagon, Secretary of Defense Donald Rumsfeld would have been involved. Would he really have arranged for a plane (or alternately, depending on how loopy you are, a missile or a car bomb) to be used on the Pentagon while he and undoubtedly his friends and staff, were there?
8) If the Bush Administration was actually behind 9/11, how do you explain the fact that they didn't fake discovering weapons of mass destruction in Iraq? After all, if they were so corrupt that they'd be willing to kill 3000 Americans, surely they wouldn't have any qualms about planting a few WMDs in Iraq.
9) What exactly is the Bush Administration's motive for engineering an attack on Afghanistan supposed to be? Militarily, that was considered to be a high risk, low reward country to invade. If it were just about "popularity" (and historically, that's a very iffy proposition), why not claim that a closer, easier target like Cuba was responsible?
10) If the Bush Administration was really behind 9/11, then surely the Obama Administration must be aware of it by now and they'd have every incentive to reveal it in order to damage the Republican Party. Why haven't they done it? Are they in on it, too?