Humanities conception of everything could be wrong. The UFOs are part of the fabric of reality or are some new kind of element thrown into the game
They are here and they are coming to clean it up, change things, watch us or end us
Until now humanity has been able to or been allowed to advance quietly, now that's over
Much of history could be a lie, it could have all been manufactured and humanity is something very different than what it thinks
They are here and they've known all about humans for a long time, and in effect whether benevolent or not, they own the species in the same way humanity owns monkeys
This story is all just the way it is, as it appears on the surface with no below, no more depth
This is some kinda alien hypnosis
They don't have to be aliens. We could be sharing this planet with another intelligence that we have yet to be introduced to
The intelligence operation possibility, has like all the other explanations, so many different possibilities of why and so many places it can go next