9/11 was eight years ago. The vast majority of people have moved on with their lives. Though the video does have some decent evidence to back it up, unlike most things that are labeled conspiracy theories (sprinkler rainbow, etc.), the world has since moved on. We have bigger things to worry about nowadays, what with 2 wars, a recession, high unemployment, H1N1, etc. What happened happened, and there is not much that can be changed about it. Bringing up something from a while back saying it's a huge issue is akin to running around with a tinfoil hat saying the local ham radio operator is controlling your mind. But, I digress.
TL;DR
It was eight years ago,we have bigger issues now.