There's a fascinating frailty of the human mind that psychologists know all about, called "argument from ignorance." This is how it goes. Remember what the "U" stands for in "UFO"? You see lights flashing in the sky.You've never seen anything like this before and don't understand what it is. You say, "It's a UFO!" The "U" stands for "unidentified."
But then you say, "I don't know what it is; it must be aliens from outer space, visiting from another planet. " The issue here is that if you don't know what something is, your interpretation of it should stop immediately.