People, while stupid, like to think they're smart. So smart that they're not falling for that official fodder for the masses that the government pumps out. Noooo, they can see through that stuff. They are, instead, more in tune with those smart and incorruptible whistle blowers who put in all the little clues in the Apollo photos. They rigged them up for smart people to see, and they are smart people.
People like to be in on the secret.
Makes them feel important. People are paranoid. There's a certain class of folk, particularly in the U.S., that are convinced their government is up to no good, keeping the people down and lying to them. This explains why their life is so bad. Nothing to do with them, it's that there Government up on Capitol Hill.