I don’t think your pay grade is high enough to make such a sweeping statement . . .
particularly given a LOT of other data i trust a LOT more that says your assertion is grossly flawed AT BEST.
Certainly it’s plausible, even likely that SOME sightings have involved stealth etc. etc. etc.
And, my relative worked around craft we built as well as craft the “ET’s” flew.
And, we have FREEPER, MD SURGEON retired injured Iraq! VET . . . who handled the Roswell debris from the real UFO craft BEFORE the military got their hands on it. Yes, he’s no spring chicken any more but as sharp, Conservative and Patriotic as ever.
It’s all a fabrication. Except for the part where peoples imaginations get carried away.
Devised, planned and orchestrated by the military, with no harm intended, just a great cover for secret research and development.