UFO'a and UAP's and Bears, Oh MY!
Taking the totality of what we know:
They easily evade any approach
They don't emit a heat signature
They don't show up on radar
They defy physics with their antics
They can just disappear and reappear in an instant
They can appear to disappear into the ocean/water without a splash at supersonic speeds
Occam's razor:
A. They are not real
B. They are real but "any sufficiently advanced technology will appear like magic"
Let's just take A, they're not real. They're an illusion, most likely a laser hologram projected from satellites or ground stations.
https://spie.org/news/advancing-real-time-3d-holographic
https://thedebrief.org/holographic-breakthrough-scientists-create-full-color-3d-holographic-displays-with-ordinary-smartphone-screen/
https://www.youtube.com/watch
There has been a "conspiracy" theory for years titled "Project Bluebeam".
Rust, Sean T: Books
This conspiracy theory suggests that humanity could be deceived into surrendering its freedoms in the face of a staged extraterrestrial or divine event.
https://en.wikipedia.org/wiki/Serge_Monast
Serge Monast was a Quebecois conspiracy theorist. He is mostly known for his promotion of the Project Blue Beam conspiracy theory, which posits a plot to …
https://rationalwiki.org/wiki/Project_Blue_Beam
Project Blue Beam - RationalWiki
Project Blue Beam is a conspiracy theory which claims that NASA is attempting to implement a New Age religion with the Antichrist at its head
PROJECT BLUE BEAM - The Quest For A New World Order And The Rule Of The Antichrist (Audible Audio Edition): Aidan Brophilius, .
..
As for B, if they're real, I'd likely go with advanced technology that's been hidden from public view (for reasons that are obvious).
B.1. Is the advanced technology indigenous to our advanced engineering?
B.2. Less likely is that it was reverse engineered from alien technology.
We have ample evidence of the existence of all of the elements of A.
We have zero actual evidence of B.2.
Given the panic over Trumps landslide victory I think they have rolled out Blue Beam early to prevent his inauguration, the anti Christ and global domination can come later.
https://www.infowars.com/posts/the-uap-ufo-invasion-may-be-used-to-trigger-northcoms-continuity-of-government-national-emergency-powers-to-stop-trump