For me it's "I don't know so I need to investigate as much as possible", there are sightings that are inexplicable and not because of lack of data, I do know that doesn't mean aliens but it turned out rocks did fall from the sky and centuries of simply saying no it had to be something else didn't make it something else... ignoring puzzles never solves them and disinformation helps no one but those holding secrets...
I think the quote from Jefferson (it might have been someone else) went something like this...
"I would rather believe two Yankee professors would lie, than that stones have fallen from the heavens."
It could be apocryphal, old quotes are hard to be completely sure about...