Well, my theory-
UFOs really became a "thing" after we started testing and dropping the atomic bomb and seem to cluster around tests and test sites.
Since I can't help but notice that we're careening towards WW3 I figure a whole lot of nukes are being fitted/refitted and moved about the globe right now - we have their attention again.
Or it's our secret shit being tested, in preparation of said World War.
So all these people that we thought were nuts or part of a global hoax were the sane juans? Cause my brother said he saw these in Indiana back in the 80s. I don't wanna have to apologize to him.
There is a not very well known tv show that I watched called project blue book. Loosely based on actual events about a couple of guys sent to investigate UFO sightings during the Cold war era. At the end of the TV show they basically imply that these things show up whenever we are close to killing off the human race and reverse the course.