Remember. You are far better educated, at least when it comes to the "news" (because of your participation on FR), than the average American. These site present the "facts" in such a suggestive way that those who don't really pay attention and allow access to their minds by the media are fooled. They come to believe the oft told lie.
I have a friend at work who is an NRA, fishing, Fourth of July guy and he believes most of this stuff. Of course, he doesn't search for news other than what he get from the MSM.
The information about the "conspiracy" of 9/11 is primarily internet fueled
Your NRA friend must be listening to some moonbats with access to this nonsense, because even the MSM with their venal hatred of Bush doesn't go there with 9/11 U.S. plots.