A lot of people have seen what appears to be very advanced flying or hovering vehicles throughout history.
It would be too unsettling for some people to seriously consider that this world might be the equivalent of someones laboratory, zoo, farm or garden.
The Fermi Paradox https://www.youtube.com/watch?v=GedAbM_dHMk
How Early Could Life Have Appeared In The Universe? https://www.youtube.com/watch?v=FpftRRm0jfA
