It seems clear to me that the case for the existence of ET's in our part of space as well as on and about our " Earth", has been long since well made.
Although I have not personally seen a UFO or an ET, I trust that the observations of thousands or more are enough "proof" for me. Can we seriously question the observations of trained observers writng there sightings off as halucinations, swamp gas, ball lightning?
My Uncle, recounted a WWII story to me in which he and the entire crew of his ship watched for more than an hour as literally, hundreds of lights in the sky held complex maneuvers over his battle group. Upon returning to port he and many others officially reported this event. That of course was the end of the story.
I can live with the ambiguity of not seeing a UFO personally without loosing my basic instinct about what is true and what is not and without mistrusting all other peoples reports because this is a "weird subject." Is this any less credible than a belief in angels, or God, or demons, wood sprites, or any of the host of human belief systems throughout our history? The cliche applies, If it looks like a duck.....