We have something happening in UFOs, and perhaps one day they can be explained, but most folks won't say a thing about them, even if they see one. The theory that they are vehicles from another planet, or another space time, has never been proven.They may be a natural phenomenon for all we know.
We simply do not know what they are. But they definitely ARE. They exist as a phenomenon.
Too many good people have sighted them for anyone to conclude that nothing is happening except the viewer going bonkers-whacky.
So far so good. Now we have to read up on Husserl and Heidegger.