Ok. I'll be the crazy person. At what point do we consider that at least some percentage of the more credible and interesting UFO sightings might be evidence o

Ok. I'll be the crazy person. At what point do we consider that at least some percentage of the more credible and interesting UFO sightings might be evidence of visitation? We now know with a high level of certainty that earth like worlds are common, and we also know that a high percentage are older than Earth. That means more time for the evolution of intelligence and the growth of knowledge in any civilization. Interstellar flight is hard, but is technically possible with technology contemporary with The Beatles: look up Project Orion and read about Dyson's thermonuclear performance estimates... And if that is possible with 60s tech, there are surely better ways. Of course we are also assuming no undiscovered physics, which is an arrogant and naive assumption given that we haven't been doing this for very long. The UFO topic is verboten largely because of all the bizarre and often silly folklore and quasi-religion that surrounds it, but it isn't hard to strip that off. For the longest time I was a climate change skeptic because of a distaste for green ideology, but then I realized that the physics of atmospheric CO2 is utterly unrelated to how humans process issues culturally. One potential answer to the Fermi paradox is that there isn't one. Life is common, intelligent life is common, and occasionally something stops by. Of course "then why do they not land in the middle of a city?" But turn that around: why would they? It would place both them and us at risk. I can think of many rational reasons not to. Edit: not arguing it is so, just thst it is possible. The more extrasolar planets in habitable zones we find, the less I think we should laugh.