Well it most certainly is if you assume that we don't know everything about physics. Our physics is merely about 250 years old. There is no reason to believe we have everything all figured out. Perhaps you have a case of confirmation bias.
I am seeking a way to explain some interesting observations. You seem to be trying to prove thousands of observers are either stupid or insane. Which is the most sensible approach?
Humanity went through this exact same argument in the 1700s with meteors:
Great quotes:
“eighteenth-century rationalists with their fancy new scientific outlook thought the stories of rains of iron rocks weren’t real.”
Sound familiar?:
” there were a number of witnesses “who saw ‘a rain of stones thrown by the meteor,’” Gounelle writes. They were from different walks of life, and, Biot wrote, it would be ridiculous to think they had all colluded to describe something that hadn’t happened. “
I’m not sure trying to disprove known physics is not insane. I’m not saying (but I don’t know) that things can’t take advantage of new discoveries, but if they do on this planet, it’s by people, not space aliens.
Even if an alien civilization could instantly transport themselves millions of light years in an instant, there is still a vanishingly small chance we would be found.
The answer is that if it’s here on earth, it’s us.