Duh. Clearly to any intelligent person these are NOT conventional aircraft, NOT built by anything known to us. That includes Russia, China, our skunkworks.
Their capabilities are so beyond us that IF THEY WANTE TO HARM US they clearly have the ability to do so - and probably could destroy us easily if they wished.
No harm nor threatening action has ever been seen over all these years - so what’s the big deal?
Watch them with fascination, wonder, and guess what they are. My guess is we will never know.
Manifestations of the spirit world? Certainly a possibility. That would explain a lot.
The frequency of the sightings parallels our development and use of artificial intelligence. It’s possible that, unbeknownst to us, AI is creating this phenomenon on its own.