You call it a ‘closed mind’ - that is a presumptive prejorative term.
What it is is a rational position. Or at least a MORE rational position in the light of decades of smoke-n-mirrors.
A closed mind won’t respond to ACTUAL evidence and truth - there is so much about this topic, and other conspiracy type subjects, that sounds like something approaching evidence, but that is the somewhat sinister nature of it all.
A hardened skeptic will respond to truth, because that’s all they are seeking - and NOT finding.
You (and others) presume these falsehoods are hiding the actual truth. As a skeptic, I presume falsehoods are the real problem, as they (most times) only lead to more falsehoods. When the reveal of the truth happens, as it will someday - I believe it will be even more disappointing at just how tawdry and banal the intent of all this actually was.
The subject is NEVER tiresome, because seeing other deluded by lies and deception should never be tiresome.
If you do not have your mind made up about the impossibility of either or any outcome re: UFO's, then I apologize for any pejorative (aka closed-mind).
Please accept my apology.
I welcome skepticism and think it is healthy.