Is there a UFO Superstition?

I have no doubt that people see, or think they see, objects, or what they think are objects, which are flying, or which they think are flying, and which they are then and subsequently unable to identify. To that extent, UFOs, unidentified flying objects, exist—and only exist to that extent.

I say that because it seems to me that people really have no concept of the scale of the cosmos. Even at a large fraction of “c” the on-board travel time between stars will be many years, probably at least decades. So why would another technological civilization come here? Because they picked up television signals and wanted to meet the cast of Friends? Because they want to exhaustively explore this galaxy? Because another consideration is the enormous, the almost economically crippling cost, in real terms of the expenditure of energy and resources, for suclifeh endeavors. Why would a society make heavy sacrifices, lasting perhaps for generations, just to have a look around? To my mind, the case for UFOs, in the popular sense of interstellar aliens visiting this planet, is as implausible as the god superstition.

Therefore, I consider a belief that aliens have visited the earth to be a superstition, due to a lack of evidence and implausibility. If you agree, why do you think such a superstition is popular, what do you think?