There also have been mass hysteria cases: https://en.wikipedia.org/wiki/List_of_mass_hysteria_cases
I would also like to mention "Folie à deux"[2]. From Wikipedia: "Folie à deux ('madness for two'), also known as shared psychosis or shared delusional disorder (SDD), is a psychiatric syndrome in which symptoms of a delusional belief, and sometimes hallucinations, are transmitted from one individual to another.".
It doesn't make it true.
If those "interpretations" weren't correct, there is very little evidence that "aliens" is a correct interpretation and that future generations won't have a different one.
In addition, the one thing that we now know scientifically is that "first hand observation" is notoriously unreliable.