"delusional liars?"
I'm sure they saw something unusual, but may well have misinterpreted what they saw. It is up to those who support the "alien hypothesis" to provide the sort of evidence that would be admissable in a court of law. I'm willing to change my mind, but until they provide that evidence, I'm quite skeptical about the whole subject. The same goes for "global warming". I do, however, believe that Vincent Foster was murdered and TWA flight 800 was shot down!
I will ask my husband and his now-grown son how they "misinterpreted" their view of several minutes' duration of a silent, upside-down spinning pie plate with windows no more than tree-top height a few houses away, and how their neighbors "misinterpreted" their sighting of the same thing at the same instant. Swamp gasses near Merced, no doubt!
As for supporting the "alien hypothesis" -- this is not a court of law, this is real life, where OJ actually IS guilty. No one has to prove anything, although you may choose to insist that they "prove" it to you. For what it's worth, "alien hypothesis" is secondary to the affect this had on my husband. Primary was the realization that he EITHER had to convince himself that he hadn't seen what he and others saw, OR accept that his precepts of physical reality were sorely deficient. The big question, to him, was not "alien," it was "do I believe my, my son's, and my neighbor's eyes, or do I tell myself that we all imagined it, and if we didn't imagine it, how can I believe in 'impossible' anymore?"
Evidence of the past, knowledge of human nature, and logic are why I, like you, think Foster was murdered, TWA was shot down, and human-caused "global warming" is a myth. For the same reasons, I think that extraterrestrial interstellar technology exists and has been seen by folks on this planet, and further, that there is a vast and concerted effort on the parts of many governments to keep it quiet. Even further ... I lean toward the opinion that efforts to keep it quiet are justified and wise.