I'm suggesting that since the beginning of time, millions of people have seen hallucinations or believed they've seen things that weren't really there, and they were just as convinced as you are that what they saw was something real. In the cases where the specific causes of their visions were eventually determined, millions of times it's been due to hallucinations from drugs, illness, environmental toxins, etc. Millions of times it's been due to varying types and styles of mental illnesses.
So, just for the record: In all of human history, of all the times any of those millions of people have seen seemingly unexplainable things, of the times when eventually a valid explanation was determined, how many of those times did the explanation turn out to be aliens from space or evolutionarily advanced, non human creatures from Earth flying around in some sort of craft? Answer in real numbers or percentages of incidents please.
And it would be silly to apply what as the cause of the sights you witnessed?