That's not how I read it. It seems to me that there are rather a lot of sane, intelligent people in the USG and especially the US military who believe in aliens with flying saucers, and alien abductions. From my perspective, it looks more like a "mass psychosis" than a conspiracy.
I suspect the abduction stories are related to evangelical beliefs in The Rapture.
QAnon tales of satanic pizza-parlour basements in a building with no basement seem to have many believers who are bright, and have no history of mental illness.
It's probably too an obvious question to ask but seeing how knowledge is continually expanded can that claim really be made with known unknowns and unknown unknows and all that? Or are we really at the edge of all knowledge of astro/physics?