Haven't heard of this guy, but here is what I do know:
1. I myself read about bin Laden's plans in the weeks before 9/11. They were in the newspaper. Just like all the other times he had warned something bad was going to happen soon. This time, something actually did happen. So it's not as if we didn't have warning, for we did and I read about it in August.
2. The NSA or FBI captured terrorist messages over the phone describing the upcoming attacks, including plans. They claim they didn't get around to deciphering the messages until after 9/11, which is why they claimed they didn't warn anybody. So yes, we did know in advance, and either didn't get around to reading what was captured in time, or we did and covered it up for whatever reason.
The conspiracy theorists point out that the one person who benefitted most from these attacks is Bush, and his administration. The ridicule has stopped, and he has a free hand to do whatever the hell he wants to do and if anyone questions him, he points out that it's to "fight terrorism," and that shuts the opponent up. His administration has rammed through Congress a bunch of legislation that they have wanted for a long time that would erode the rights of U.S. citizens while increasing the power of the government. 9/11 gave them the reason to get this through.
So there is a plausiblel reason why the government might have known about the attacks and chose to do nothing. No doubt, under this scenario, they had no idea the attacks would be as successful as they were and that the buildings would actually collapse. I'd like to think, even as I spin this imagined scenario, that they would have acted had they realized the depth of the destruction that would follow.
None of the above is true, just a possible scenario under which it would make sense for the government to know in advance but do nothing. And for those of you horrified to think that a government could williingly allow Americans to die in order to further an agenda.....what do you think governments do??