One more bit of historical information about DU, Mac -- which I was reminded of because of Jack's mention that DU used to be very friendly toward 9/11 skepticism and other "parapolitics" analysis.
Have you ever heard of the "Gannongate wrinkles" threads? That explains I think about 90% of why the mods treat the 9/11 forum the way they do, and it has to do with having been burned.
http://www.democraticunderground.com/di ... id=3144209
http://www.democraticunderground.com/di ... 79#3200711
Back in early 2005, you may recall, the planted republican fake journalist Jeff Ganon, of the White House press corps, was revealed to be not only not a real journalist, but a homosexual male prostitute named James Guckert. The liberal blogosphere was atwitter for several weeks.
Then someone on DU and people elsewhere came up with the intriguing idea that Gannon/Guckert was some sort of "Manchurian candidate" character. It was believed that he was the grown up victim of a child kidnapping named Johnny Gosch.
DU ran several threads of research into the Johnny Gosch story, which was truly bizarre enough. To make a long story short, Gosch disappeared during the Bush I regime, and his appearance seemed to be linked to the so called Franklin credit union scandal -- a multifaceted, stranger than strange story of a Nebraska child abuse and child prostitute ring that reached all the way into the Bush I White House, and that involved prositutes used for intelligence and blackmail purposes in DC, and gay male child prosititutes being given midnight tours of the Bush I White House. It was speculated that paperboy Gosch was "disappeared" into a child abuse/prostitution ring.
Someone came up with the idea Gannon/Guckert was the grown up Johnny Gosch. Thousands of posts, some quite hysterical, were entered into DU analyzing the evidence. It turned out, however, that Gannon/Guckert's school records were inconsistent with a Johnny Gosch connection, but the mainstream media picked up on it and DU got one of its first mentions in the New York Times as the crazy place where people thought that Jeff Gannon was a long ago kidnapped Nebraska paperboy.
At that point, it seems, the mods decided that DU would never again be identified with "crazy conspiracy theories," and that's when it's very harsh treatment of 9/11 skepticism started.