I was like you, I also saw some of these 911 conspiracy theory videos and started to question it all as you are doing now, healthy skepticism is in deed a good thing.
But you need to be more rigorous in your thinking and not just accept the view of the people making these youtube videos. This is exactly the same thing as just accepting the mainstream media's view - wouldn't you agree?
The site linked below discusses and challenges the points raised by the conspirasists and the so called truth movement. If you look at the site they discuss and debunk every issue raised with separte links links for each issue.
http://www.debunking911.com/pull.htm
I think this quote sums up the state of the so called "truth movement" and the dangers of just taking internet based content as gospel.
"Staking their fortunes almost solely on Internet-based content may have been the 9/11 deniers’ biggest mistake. What seems like a perfect place for pseudoscience — the Internet is un-edited, without fact-checkers or minimum publishing standards of any kind — also became a perfect place for a rapid-response system of blogs and forums to fight back."
As I said before I believe many people choose to believe what suits their own political agenda and biases. By some of your comments it sounds like you have an anti-American bias, I'm not sure but you raise issues like Libya and death of Iraqis sounds like you may have an agenda yourself in which case these videos would fit nicely into your world view and don't need to be challenged.
I know in the middle east many believe in these 911 conspiracies and believe it was a "Xionist Plot". This suits there beliefs and world view so they don't really challenging what they here.
