Why are reasonable people with reasonable questions about 9/11 being discredited?

Probably because no one watched Alex Jones' "Martial Law" and they instead watched Michael Moore's "Farenheit 9/11". Probably because David Icke is still fairly unfamiliar to most people, and FOX News is much more convenient (and easier to accept). Probably because it's easier to go along with the status quo and be accepted in society than it is to seek knowledge and argue the truth with blind people. Probably because when 9/11 hit, it was followed by the Patriot Act, which basically said that if you disagree with the "official report," you're not a patriot. And really, for lack of a more eloquent way to put it, people are dumb.