Interestingly, and conversely, people can also not see things that are actually there. You can look this up, knowing that I am spoiling this for you... It's called the invisible gorilla... It's basically an attention test.
https://www.youtube.com/watch?v=vJG698U2Mvo
This kind of coincides with anecdotes I read in anthropology where humans who have never been exposed to photograph couldn't see people in the photographs- until they were taught how to see people in photographs. Supposedly, and I would accept this being downgraded only being anecdotal, that the Native American on the shore could not see the Pinta, the Nina, or the Santa Maria approaching because they had never seen boats. It was just strange clouds. It took a shaman standing there for hours to see them, and once he did, he taught his people to see them and probably said, 'this is not going to go well.' (I am not saying he said that, but I thought it was funny.)
Umm, I wonder, if no one ever looked up, if they would ever see a UFO? The night sky is almost gone, and soon even the brightest objects in the sky may be washed out due to city light pollution. I wonder if people will come to doubt stars exist...
"For example, if we believe that UFOs come from outer space, we can announce that a bright light hovering in the sky is proof that aliens have arrived in a UFO." Most people who believe UFOs may be aliens don't automatically assume that any one light or all lights in the sky means aliens. When things happen and there are witnesses, credibility goes up with the number of witnesses. You quoted great stuff. Maybe a dozen witnesses get the make and model of the cars all wrong. We can still agree there was a car accident. Most UFO reports tend to start with, "What is that?" No opinion at all. "I thought was a US secret aircraft," was Stan's thoughts. Stan Michalak thought the UFO that landed where he was working was US Military having problems with their experimental craft, and walked over to them. He called out English, no response. He call out in Russian and French, as he was educated. He touched the craft before it sped away. This is called the Falcon Lake Incident. To this day, no one could explain his radiation burns. It nearly killed him.
Most educated people believe aliens exist, somewhere out there. If life happened naturally on earth, then there will be aliens. Are there people who don't believe in aliens at all? Sure. Humans are complicated. Statistically, betting against there being no sentient life in the entire Universe but humans, bad bet. The next bet, can they be here? Dinosaurs were around for millions of years. Assuming there is a sentient race out there that has lived that long, theoretically, per Sagan, the best way to find evidence of them is in history and archaeology, because they would have already arrived.
Confirmation bias works for both camps. The no alien camp and the alien camps both hold biases. That's easy. All humans hold biases. That's almost like saying, all humans poop. Did you know there are some scientist that won't even consider data that doesn't support their paradigm? They will go out of their way to offer any terrestrial answer and not even look at the data, which includes multiple sets of data, longitudinally over 70 plus years. Even when the witnesses are government officials, with multiple data set points, like radar, infra red, gun camera, and human eyes...
I love you, Ugar. You are persistent. You are consistent. And, God, if you are not determined to talk some common sense into us believers. I will keep reading you, if you will keep reading my craziness. (If you're tired of me commenting, just tell me... I have grown to like our conversations.)
I forget who pointed this out, though. For your position to hold, you have to be right 100 percent of the time. I only have to be right once. Should I not give up and remain vigilant and persistent, I think I will find it. Technically, it won't be me. My group, the people who believe the evidence is weighted in one direction... The ones that keep asking the hard questions and pushing for explanations and for the government to be more transparent when everyone else has already been satisfied with an answer that it's not anything worth all this fuss.
Hang in there. We'll get through this together.