As usual, no good reason has ever been given for anyone wanting to conceal such a discovery.(If extraterrestrial life or its remains were found in the Solar System, all space programs would likely receive a mighty increase in funding.) Examples are Richard Hoagland and Mike Bara, who have rebutted hoax claims, but continue to use Apollo imagery as evidence for alien structures on the Moon and believe NASA to be involved in all kinds of cover-ups.The fact that an Apollo spacecraft would have been clearly visible on earth orbit is completely ignored.(For all we know, it was visible; whether it was possible for anyone to identify it as an Apollo spacecraft, that's an altogether different question.) Some people believe that the earlier landings were faked, but that NASA finally managed to get there some time in the 1970s.The landings converted a few of them, but many are coming back now and getting off of it." America, never mind the fairly accurate estimation of the Earth's circumference by Eratosthenes, are but two of the many known references to belief in a round Earth predating the moon landing.
A number of people are silent on the shape of the Earth but nevertheless believe that no Apollo astronauts ever went into Earth orbit.
but persistent, number of people who think that the Apollo Moon landings of the late 60s and early 70s were staged and faked propaganda films produced by NASA in pursuit of embarrassing the USSR in the Cold War, as opposed to the actual moon landings taking place being an infinitely greater triumph of the US over the USSR - but disregard that fact.
The exact form of such beliefs varies and can cover anything from "the Apollo astronauts never went to space" to "they eventually landed on the Moon, but the first landing was faked", not to mention wilder claims ("the Apollo program was a front – they went, but on flying saucers").
They assert that the program was behind schedule and the United States faked reports of the first landing to fulfill Kennedy's unofficial deadline of "before the decade is out" and/or to score the first landing before the Soviets managed to get theirs.
A number of conspiracy theorists do accept that NASA went to the moon, and — with unmanned probes — the rest of the Solar System; however, the things those craft saw were so incredible that The Powers That Be had to doctor the photographs to hide evidence of aliens (or Space Nazis).