2. If we expect to know the truth
IF corrupt elements within our government allowed or actually assisted the attacks of 9/11, it's imperative for us to know. The security of our nation absolutely depends on it.
IF we expect to find the truth, we can't ignore evidence that falsifies the official theory. For example, if we accept the premise that 19 Arab hijackers were the sole perpetrators of 9/11, we cannot explain what caused the pools of molten metal in WTC 7. That molten metal irrefutably establishes that something other than fire was at work on the steel support columns of the building. Analysis of columns taken from the wreckage has revealed exactly what that "something else" was. It's an incendiary known as thermate. Until we find out who placed and ignited thermate in building 7 (and how they were able to bypass security) we're going to remain miles away from knowing what actually took place on 9/11.
IF those who insist on defending the government's theory want to silence the critics, they've got no choice but to engage in a real "legitimate" debate. The time for name calling and childish ridicule has long since passed. Repeating the word "whack job" or "moonbat" simply isn't working anymore. It does nothing to make the evidence surrounding WTC 7 (or any of the other evidence for that matter) go away.