You have to consider a wider range of possibilities. Maybe there are some aliens in space ships out there, but if there are other dimensions, potentially an infinite number of them, and if beings there know how to access ours, and if they have the knowledge of how to direct images directly into our minds, we may never find out what is going on. Or maybe Jung was right, and some of these phenomena come from the collective unconscious. The "Ancient Alien" people may be right in finding evidence of intervention in our remote past, but naive in saying that ETs are responsible. It may be also the case that long ago we were part of the whole system, as it were, but something happened that caused us to lose contact and forget our roots. All this is a lot harder to get a handle on than the ideas about disclosures and alien bodies being shown to presidents, flying saucers crashing all over the place, and so on. The disinformers know that playing the aliens card will (1) attract and excite the believers and (2) alienate the people who regard themselves as serious scientists. Maybe they know something about what UFOs are and where they come from, but their immediate aim is to prevent people finding out about all their black projects, especially the field propulsion stuff.