Humans are not reliable narrators. We have been fooled about observed phenomena so badly so many times before.
Aliens are exciting so people want to believe. It’s boring to conclude that your brain spazzed out and you saw something that wasn’t real. Or that you saw some strange looking natural phenomena that you don’t understand. But this happens all the time. Not to mention hallucinations, altered mental stages, optical illusions, exotic atmospheric phenomena, and so on...
I would need the most compelling evidence humanly imaginable to seriously consider the idea.
UFOs exist. Jumping to the conclusion that they must be controlled by sentinel beings from someplace else in the universe is a rather giant leap though. Sometimes they are simply "unidentified" flying objects.
Skepticism is normal and understandable but I'm surprised at the amount of uninformed skepticism on this topic here. It seems like a lot of people still don't know what's going on.
So many credible, high-ranking people in military and government have come forward over the years. Edgar Mitchell had a PHD and walked on the moon and tried to tell us about UFOs.