I've had a couple of strange sightings myself, but what they were I would not be quick to speculate. I've seen some very "credible" people exaggerating the story because of their personal beliefs in the UFO's like Nick Pope. I think eagerness to believe in something, anything make otherwise rational people do irrational things and then they try to rationalize it to make sense of it for both us and them. I don't know just my view I guess.
But as Ellie Arroway puts it The universe is a pretty big place. It's bigger than anything anyone has ever dreamed of before. So if it's just us... seems like an awful waste of space.
Though if it took us millions of years to evolve to this stage, why do we even think it took any less other potential living beings out there? They may be at about the same technological level as we are or even slightly less.
I mean 14 billion years which is the age of the universe leaves only so much room for anything to happen, right? Not to mention that we live in a very old galaxy of 13.6 ± 0.8 billion years i.e. ours was here right from the beginning, and it took us on this planet all this time to develop into something. And yes I took into consideration that different parts of galaxy would cool at different rate so life would appear at different stages. It is just hat we are at the very brim of Milky Way so we had longest time too cool. It seems to me we has some of the most favorable conditions of all and yet here we are at this level of development.
So for a civilization to be a 1000 or even a million years ahead of us technologically something pretty extraordinary had to happen. Prove me wrong.