Again you've missed the point. It was maintained that it has never been proven that alien craft exist. I just pointed out that alien craft have never been proven to exist to that poster, but could very well have been proven to other people...
Proven, how? Are you talking about alien abductions?
How do you know that all those experiences weren't dreams, hallucinations, hypnagogia, sleep paralysis, or any number of other psychological phenomena?
Those kinds of phenomena are well-known to cognitive psychology, and for centuries have been responsible for experiences of the supernatural, paranormal, spiritual, religious, otherworldly, and just downright weird. Those psychological effects are well known. They may be unusual in the sense that they do not happen to most people, but they're not in any way extraordinary or beyond the scientific understanding of how the Universe works.
Alien spacecraft, on the other hand, are quite an
extraordinary, and
unknown thing. No evidence has ever been shown that confirms that extraterrestrial life even exists, let alone intelligent extraterrestrial life with the extremely advanced space travel capability required to span interstellar distances. Alien spacecraft are far beyond the scientific understanding of how the Universe works.
To this day, no evidence has ever been shown to prove that extraterrestrials have ever visited Earth in spaceships. Stories are not evidence, and the extraordinary "performance characteristics" sometimes described by UFO storytellers are also far beyond the scientific understanding of how the Universe works. If an actual physical object indeed displayed those characteristics, it would be a violation of the laws of physics as we understand them. Therefore, until some evidence surfaces that such things are even possible in the first place, those kinds of reports are most likely attributed to misperception, imagination, hallucination, or confabulation. Those reports are
extraordinary claims, and therefore require
extraordinary evidence.
...and asked how the poster could be so sure it hasn't been.
See, here's where
you keep missing the point.
What you did there in the highlighted part above is make an
argument from ignorance.
What you did, in effect, was to say, "you can't prove it
doesn't exist, therefore it
does." That is a logical error. There's no possible way to prove a universal negative. Therefore, the burden of proof is on the person making the claim to
show evidence that it's true, not on the person challenging the claim to
disprove it.
Once you start taking wild stories at face value and using arguments from ignorance instead of critical thinking, then all bets are off. You might as well start believing in witches, ghosts, gods, portals to Hell, boogeymen, bigfoot, Nessie, chiropractic, the 9/11 Truth movement, giant talking bunny rabbits and every other silly imaginary thing that comes down the pike.
Is there some priviledged inside knowledge the poster has on this? Can the poster get inside the heads of the witnesses to experience what it is they have seen? Do they have access to Space Command data?
Do
you?
Do
you have privileged knowledge, on which basis to make your extraordinary claims? Can
you get inside the heads of the alleged witnesses to know they aren't lying or imagining things? Do
you have access to Space Command data?
We're not the ones making the extraordinary claims about outer space aliens flying around our skies. We're the ones thinking critically, asking all the important, relevant questions that any good scientific skeptic would ask of anyone with any extraordinary claim. We've asked to see the evidence, but all we're getting is endless bald assertions, storybook recitals, appeals to misleading authority, unfounded speculation, logical errors, dishonest semantic switchcraft, appeals to science fiction, and whiny accusations of persecution, just for asking.
Of course that set off all the irrellevant commentary that provided no answers because we all know that making blanket and completely polarized statements concerning this issue betrays one's bias and the skeptics here typically scurry to bury the evidence of that bias as fast as they can by throwing anything they can on top of it.
We're not the ones with the bias here. Skepticism is biased only toward
that which has been confirmed as being consistent with reality.
Quit shifting the blame onto us for your own failures, and the failures of UFOlogists worldwide who reject logic, critical thinking, and any standards of evidence in favor of their pet faith in outer space aliens. You want us to respect your claims, then show us the evidence to support them just like everyone else has to do. Your special pleadings cut no ice, and your crybaby act is just pathetic.