The thrust of your reply, if I understand it correctly, is that ET-piloted aircraft are inherently more plausible than ghosts and other such supposedly paranormal phenomena.
Even if that were true (and I don't think it is - ETs living on other planets yes, ETs travelling to earth to perform physically impossible maneuvers in our atmosphere for no apparent reason no) it doesn't alter the fact that the standard of evidence is no better than that for supposedly paranormal phenomena, several of which have been shown by careful application of the scientific method not to be real.
The only reasonable assumption for the remaining phenomena for which such experimental verification is impossible, until and unless better evidence is produced, is that they too are due to the same human errors and cognitive biases as the ones which can be experimentally shown not to exist. And the more time goes by without such evidence appearing, the more reasonable that assumption becomes.
Everything that is said above is fine up to the point where it is claimed that "The only reasonable assumption ... ".
How does one "reasonably assume" that "human errors and cognitive biases" can explain how a USAF pilot can chase a UFO in a jet for 2 minutes during the daylight, come to as close as 500 yards, see it clearly as a flying disk, and watch it zoom off leaving his jet behind in a matter of seconds. If there was human error, the pilot would not have been able to fly his jet, let alone stay on the tail of a UFO for 2 minutes. That takes coherent, conscious, action and fast accurate reflexes over an extended time. So it isn't
reasonable to conclude there was any human error or misperception.
What kind of "bias" is involved in reporting the description to his commanders? USAF pilots are trained to recognize many kinds of aircraft, including known exotic enemy aircraft. It isn't
reasonable that he would fabricate the shape of a disk.
Then add that the pilot was sent to intercept the UFO because it was picked up on
radar ... then add a bunch more similar cases ... and then many many many more from civilians that don't have any natural or manmade explanation.
It's not
reasonable at all to dismiss all these other incidents, but one's own
scientifc minded bias enters the equation and becomes a mirror of prejudice: From Wikipedia on Occam's Razor
"A theory that is compatible with one person’s world view will be considered simple, clear, logical, and evident, whereas what is contrary to that world view will quickly be rejected as an overly complex explanation with senseless additional hypotheses. Occam’s razor, in this way, becomes a “mirror of prejudice.”
It has been my experience here that the "world views" between the skeptics and believers are so divergent that it is almost impossible for either side in the debate to see it from the opposing side's point of view. I can claim all I want that I understand the principles of science and logic behind the assumpions made by both skeptics and myself, but it doesn't matter to most skeptics. They simply proclaim that I couldn't possibly understand or I wouldn't believe what I believe.
It's a common historical fallacy for people to take the "you just don't understand, therefore you're wrong" position. It's even worse when someone takes the time to demonstrate that they do indeed understand only for the explanation to be dismissed without any valid explanation, usually by some ad hominem attack. Why do people do that? Is it fear of being ostracized from their skeptical community? There is clear evidence in favor of that.
If you're going to buy into the big box scientific institutional paradigm, you can't be seen as being woo-woo until you've got your Ph.D. and tenure. If anything, the real bias is on the side of the skeptics because they have everything to lose by admitting they could be wrong. On the other hand, the case for bias in the experiencers is exactly the reverse. They are often reluctant to make the claims because of the fear they will be socially attacked and stigmatized ( this forum is proof enough of that ).
For all these reasons there is no justified basis for claiming the
only reasonable assumption for all UFO reports is human errors and cognitive biases ... Given the wealth of information, it is far more
reasonable to assume that UFOs are real and that they aren't any natural or manmade phenomenon ... where does that leave us to look next, if not up?
j.r.