But these guys never have any real proof, that's always the catch. My daughter truly believes in Santa because in her mind all the experts (mom and dad, other adults) say there is a Santa.
Good points, Christopher. I guess I was looking at it from the perspective of them "passing through" and using our planet, like interstellar nomads. Not coming here specifically just for Earth, but just using it as another thing to be expended. Everything runs out eventually and they would have...
I think UFOs and aliens are two separate things. I think UFOs are an interesting phenomenon of perception. They tell us a lot about humans but nothing about aliens. Life on planets other than Earth likely exists (or has existed) in some form but it doesn't mean they ride around in flying...