I think they're actually some of the same people. IIRC one of the main figures involved in producing that stupid documentary about the moonlandings being faked is also a leading light among the 911 "skeptics".
Words cannot begin to describe the hatred I have for these people who, you know, are only "asking questions". For some incredibly stupid or dishonest reason, they need all the information tied up into a nice little package with a pretty bow on top of it, or they'll declare it "questionable".
And then our opponents from DU and lefty blogs will link to this thread to show how crazy we are.