It is very highly improbable that UFOs are in any way alien technology and less probable, it that is possible, that they contain aliens.
I share the doubts. Ironically, skepticism about UFOs being space aliens (or their having visited Earth in general) is at least one area where non-biologists finally get a bit sensible about extraterrestrial intelligence. Whereas in different contexts many scientists seem to rhapsodise about sapient life forms being abundant in the Milky Way. Physicists, chemists, etc tend to take a deterministic stance about natural selection outputting intelligence; whereas biologists tend to take an opportunistic view whose pessimism is occasionally mitigated with appeals to convergent evolution (which Gould emphasized in regard to the subject).
I assert this for three main reasons: [...] (2) With millions of stars more interesting, than our very ordinary and small sun, why would the aliens (or their robots) come to inspect this boring, common-place, little star with a million or more better choices, many much closer to them?
Von Neumann probes would be replicating their way over the galaxy without necessarily any specific targets interest of beforehand. I.e., they might chance upon _x_ in the course of those explorations. But as for the solar system (and especially Earth) being "boring" [while acknowledging in fairness that you may only be glancingly / indirectly touching upon what I'm addressing here] ... That's one of the more disingenuous cliches that's been uttered or set to text for decades. It's extracted from the supposed apathy / minimal curiosity of humans in general [and what the exploitive interests of commercial / industrial enterprises can be limited to]. Rather than the wide-ranging "egghead" fixations and interests of the scientific community itself. Which includes efforts to continuously catalog and index the existing phenomena on Earth and "out there" (an endeavor prior to the theory-making and explanations the expanding database may stimulate).
Despite there being circa 400,000 species of beetles, entomologists still go bonkers over tiny jewel beetles like Lepismadora algodones being discovered. Researchers are interested in barren landscapes on Mars and other astronomical environments which might seem boring / uninteresting to the average person [once the initial novelty wears off and the lack of
Barsoom aborigines,
Annunaki, tribbles, etc becomes apparent]. Zoologists and anthropologists alike have obsessed over documenting the behaviors and rituals of specific animals and human cultures (respectively) in minute detail no matter how common ("seen this before") they might be. Just imagine how crazy they would go over discovering "space alien" habitats and societies and having access to them (i.e., there would no such thing as a "boring" for them in that territory).
For us to even grudgingly allow that "intelligent ETs might be studying / exploring beyond their own world" is to unavoidably be projecting anthropic characteristics like scientific curiosity upon them (as if labeling them "intelligent" isn't already doing that). Which would embrace the above passions wherein there is no planet too mundane to not be wasting study / itemization time on.
Add to that the likelihood that any interstellar space exploration would be conducted by Von Neumann Probes (as illustrated in
2001: A Space Odyssey) or whatever "
robotic life", which could either hibernate or retreat into the innerspace of virtual reality preoccupations while crossing the centuries and millennia between planetary systems... Then there might be entities with potentially even less concern about becoming bored by the antics of fauna and flora on Earth. If they had been around for ages and outrageously contributed to the evolutionary development of human ancestors (like Clarke's black monoliths), then the tendency to "hang around" would be deeper yet -- to observe what happens and serve the role as sentry or guardian.
But that said, and to return again to the start: I don't optimistically consider the Milky Way to be overflowing with sapient organisms and artificial explorers, so that they have chanced upon us in the course of taking extraordinarily long voyages between stars. I'm just dismissing Earth as "boring and mundane" as a reason for what would be their absence in poking Earth research-wise (if such beings / robots were available).