Conspiracy theorists always assume that everyone but us is far more intelligent and advanced than we will ever be, whether it be aliens, ancient Egyptians (who may or may not have been aliens) or lizard people (see the other parenthesis). So we are too stupid to ever be able to land on the moon, but every unspecified alien is way ahead of us in intelligence and technology. It makes perfect sense! For certain values of sense.
Oh, the conspiracy theorists are the exceptions of course; they are every bit as intelligent and advanced as the Egyptian lizard aliens, if not more.