No I do not believe in UFOs other than they are truly unidentified by the people who can't identify them.
a few points
before light pollution humans knew the night sky well and were extremely aware of it, the constellation names all date from peoples attempt at understanding the firmament and those little lights that showed up at night. the appearance of a comet (really the only thing other than the incredibly rare supernova that changed in the night sky) were considered ominous portents of doom, the Bayeux tapestry has a representative of the comet we know now as Halley's . nobody knew what a comet WAS but it was definitely not a UFO
These were so well documented that Halley was able to predict the reappearance of his famous 75 year cycle namesake. Aside from the planets which were well known and obviously imperfectly understood and the occasional shooting star and fireball there are no documented UFOs of the type people are referring to. Copernicus, Galileo, Tycho Brahe, Kepler, Newton, Halley, Messier, Hershel and innumerable others made it their life's work to look at and understand the night sky. nowhere in their volumic output was a UFO type event ever mentioned to my knowledge.
It was not until Sputnik, airplanes, Satellites and people no longer knowing what Venus was and were it would be that UFOs even became a thing. who knows what secret shit our and other governments are working on as well.
our radio signals have only gone out into space for 100 light years. While there are thousands of stars within that expanding sphere it would require them to get the signal and then travel at some fantastical percentage of the speed of light to get to earth even if they chose to do so. the fastest man made object in history is voyager 1 travelling at 38K miles per hour. it would take 70,000 YEARS to reach just the closest star Alpha Centari. and they had to turn off an experiment on that spacecraft just this week because the nuclear reactor generating power is starting to fail. it will never make it 70,000 years.
Never mind the fact that a civilization remotely capable of doing that would have to use some sort of light transmission for communication purposes and we have never detected anything despite the Very Large array VLA specifically designed for that purpose and scanning the skies continuously for the last 46 years as well as crowd sourced efforts as well. the cosmos remains silent of any discernable transmissions similar to what we have been sending out. the tiny blue dot in the insert is how far our radio waves travelling at the speed of light have propogated though the Milky Way. The scale is literally beyond our actual comprehension.
so to believe its aliens, we have to think that either they have been hopping star to star for time beyond our comprehension and just happened to pick the time we started putting lights in the sky to arrive or they have some way to communicate across the vastness of space without relying on lightwaves which we could easily discover if they are local.
I am certainly open to the idea of life elsewhere in the universe and believe it is very likely Almost certain. It is impossible to speculate on sentient life elsewhere IMO, much less the technology barriers needed to be crossed for interstellar travel. Hell we are likely to run out of time as a species before we cross those barriers ourselves the way things are going. All the science fiction stories about warp drive, dilithium crystals, wormholes etc are fantasy devices devised to create stories and get around the cosmic speed limit of light which Einstein proved.
