Labster, just chalk it up as Facts VS Truth; for some people, Facts are not everything, and in fact for them are pretty much mutually exclusive to Truth. They'll never believe that a vast "we landed on the moon" deception requires too many people to have remained quiet, regardless of how much of a money maker it might be. In fact, you could probably give them a ride up to the ISS tomorrow, leave 'em there a week, and they'd STILL swear up and down it was faked.
"You know how parents tell you everything's going to fine, but you know they're lying to make you feel better? Everything's going to be fine." - The Doctor