I have a friend who was on a stake out in Mississippi and saw one. He was pretty agnostic about all of it before he saw it, and today he has no idea what it actually is, but he said that it was so clearly beyond what he understands to be feasible that if it IS man made, then he wonders why that race of people hasn’t declared itself supreme on Earth and just subjected us all.
That was his take on it, and his rationalization for why he doubted it was manmade.