Just so much bullcrap
Unfortunately, with the technology of the day, an immense pay load and a new rocket much larger than the Saturn V would have been needed to land a spacecraft directly on the Moon and then return it to Earth. That would have meant considerably greater expense and several extra years of development that would have violated JFK's pledge to get to the Moon by 1970.
A solution was contrived by a NASA engineer, who eventually got a hearing from higher ups: carry a lunar lander but do not bring it back to Earth. This reduced the payload needed and meant that the Saturn V and the Apollo spacecraft and a lunar lander could be used to beat the Russian and get to the Moon by 1970 as pledged.
yeah I know, you don't want to know....its human nature to avoid scary subjects....