Just as you say, CC.

People's skeptical (and uninformed) denial of the incidents in Washington D.C. in 1952 or over Phoenix in the 90's are indicative of just how reluctant they are to even consider anything that does not dovetail with their already established opinion which is that there are no ETVs and there can't be.

They don't want to hear about any real evidence such as radar contacts, mass sightings, scrambled jets in pursuit of same, eyewitness reports, because it would require them to admit they might be wrong about something. And they won't give any of their valuable time to look seriously at anything along that line. They would rather just keep on being "right" for the rest of their lives, even if that requires remaining ignorant.