Because we'd have lots of scientists speculating publicly how these things operate based on existing science. We don't. Not that I've seen. But I don't even have cable television anymore, nor watch mainstream news, so I might be missing that. I read a hell of a lot though! And I don't see this being mentioned.
I am not sure I follow. Are you saying that because scientists aren't publicly speculating on how these craft work that they must me alien in nature? If so, wouldn't the scientists then be publicly speculating on the nature of the aliens? Wouldn't that be the bigger story?
It seems to me that if the scientists aren't discussing it, they must not feel it's interesting enough to discuss.
