@Mister --
Not even a large percentage of educated pilots hallucinate, even in the best of conditions. Not to mention again, there was radar confirmation.
Yes, because for the most part their hallucinations don't coincide with their time in the air. The military has to hire humans so they therefore have to hire people who hallucinate since all humans hallucinate to some degree.
These guys, according to Military Law, get medicals all the time. Most of them are given a full bill of health.
You don't know much about human physiology do you? Perfectly healthy individuals hallucinate too, it's not necessarily a sign of illness, though a sudden rash of vivid hallucinations could indicate some sort of problem. It's a side effect of the way our brains are wired and the way they interpret sensory information.
Our brains never get the full picture from our senses. Even our eyes technically "see" things as a sort of stop-motion picture, with large packets of data missing(and then there's the "blind spot" that we all have, caused by the optic nerve penetrating the retina). Why, then, do we not perceive the world this way? Because our brains do their best to fill in the gaps with guesses based on other information sources and previously known information. This leads to all sorts of really cool optical illusions which are a sort of hallucination(sensory input that doesn't correspond with reality) and we are all subject to them at roughly the same rate. It's a fact of biology, you can't argue this away with appeals to authority or consequences.
And you completely skipped over the memory editing function of the brain too, but I can give you more on that at a later time.
Explaining all these sightings off as hallucination
Who said that all of them are hallucinations? I certainly didn't, I said that this one was most likely caused by hallucinations and radar error. Coincidence might be distasteful to you, but it's a hell of a lot better explanation than yours, which basically comes down to "I can't explain it, therefore I can explain it".
but such hallucinations are really reserved normally for schizophrenics and other chemically-disturbed brain activities.
LOL! You really are displaying your ignorance here. We're not dealing with physics, which is the only field you've claimed any significant knowledge of, we're dealing with biology. You've strayed from your realm of "expertise" into a realm where you're little different from a mewling babe.
Everyone hallucinates just as surely as everyone lies, the only variables are how often and how vivid it is. We know that the human brain is more than capable of creating entire illusory worlds with varied and different populations, even going so far as to create different personalities for different people in the hallucinatory world. In fact, if your brain ever really knuckled down to "fuck with your head"(sorry, I had to) you would be unable to discern the difference between your hallucination and reality. Given these capabilities(without which we wouldn't be able to function as we couldn't interpret our senses in a working manner), and given the fact that we all have minor hallucinations of no real importance(did you ever think that you saw something of a specific color only to later discover that it wasn't really that color? There's a good chance that you hallucinated there) almost on a daily basis, and given the fact that our memories are edited after the fact by our brains so that they fit our worldview better, is it any wonder that pilots hallucinate as well? After all, they are human.
Also, assuming then from what you qouted, you seem to be saying even the radar communication ''guys'' also hallucinate.
Yes, I did say that everyone hallucinates, but I didn't say that everyone hallucinated everything in that "event". The radar guys might have seen something, but radar failure happens, hence why I said it was probably a coincidence. Do you have any evidence that the radar device in question was in working order at the time of the sighting?