I don't know how I can raise attention to the issue in a better way than to point to one specific example where a lot of people here including top posters have gone terribly wrong.
In all this discussion it might help to ask yourself "there are a lot of smart people who disagree with me. Maybe they haven't really gone terribly wrong. Maybe I'm wrong."
The notion that top posters could be extremely wrong is not by itself implausible. I can without much effort think of multiple points where I strongly disagree with a variety of top contributors. Moreover, I can point out examples where top contributors apparently don't agree.
But that's not the same situation as this. This is every single major contributor and a lot of other people aside disagreeing with you.
There are occasions when arrogance in the face of popular opinion is healthy. But whenever one is in a situation that seems like one of those one should ask whether or not one is really in that sort of situation. Take the outside view for a minute. Even if after thinking about it, one decides "nope, they really are that wrong" it might make sense simply as a matter of rhetoric/Dark Arts/getting-people-to-maybe-listen to not act like one is so sure of one's self.
It does seem that your repeated activity on this matter on LW is not being helpful. So even if the above advice is not useful, it may still make sense to consider switching to a different tactic. Two obvious tactics are to make specific predictions about the actual world that would be likely to be different if the federal government was involved in 9/11. I've added to PredictionBook four predictions related to this as examples: 1, 2 3, 4. PredictionBook is of course the easy way to do this, there's nothing at stake. The other tactic is to make actual bets over such predictions.
I am willing to take any of those predictions and make a bet with you over them in the range of a few hundred dollars. I'm also willing to negotiate a LongBet over them. If none of these predictions fit then we can maybe discuss other possible bets along similar lines. This is precisely the sort of thing that will get us to actually listen: show that your beliefs pay rent, and even better make a prediction that turns out to be correct that the standard model of things will predict is very unlikely. That's a way to get us to sit up and take notice.
People who go back and downvote every post or comment a Less Wrong user has ever made, please, stop doing that. It's a clever way to pull information cascades in your direction but it is clearly an abuse of the content filtering system. It's also highly dishonorable. If you truly must use such tactics then downvoting a few of your enemy's top level posts is much less evil; your enemy loses the karma and takes the hint without your severely biasing the public perception of Less Wrong's discourse.
(I just lost over 200 karma in a few minutes and that'll probably continue for awhile. This happens to me every few weeks. Edit: I mean it's been happening every few weeks for a few months for a total of only three or four. Between 400 and 700 karma lost total I think? I don't mean to overstate the problem.)