When I was in my late teens, I saw what I could easily have believed was a UFO full of people, were I inclined to be that sort of gullible. I was driving on a street near the West Palm Beach airport, and glanced up and to my left to see a cylindrical object with lighted windows and people flash by silently. I “knew” it couldn’t be an airplane, because the runway ran in the wrong orientation for it to have been that low at that point. A UFO checking out the airport? No. A different runway that I didn’t know existed, and probably an airplane with the engines throttled back that I couldn’t hear because the windows were up.
If I had chosen to, I could have convinced myself that there was no explanation except a UFO. Instead, as is most likely always the case with such things, there was simply an explanation that I lacked the information to appreciate.
Lack of information proves nothing — except lack of information.