It is almost beyond comprehension that people here are promoting this smear.
I also read on DailyKos that 9/11 was an inside job. They had lots and lots of "proof."
If someone said that, they were just some random lunatic, and not representative of the site.
It was actually widespread enough a problem that DailyKos eventually had to come up with a zero-tolerance rule on such diaries and posts, because they were worried about people associating that crackpot garbage with the site.
It looks like DailyKos is going the same direction with this smear too—good for them. It's just so patently offensive and unbelievable to most people (for good reason) that it makes them look like absolute trash for suggesting it.