Of course, Captain Obvious, that’s why they are called Ufo’s. People are left to use their imagination. Is that a bad thing?
Not at all. I'm a big fan of science fiction. But until there is tangible proof, Sci Fi is all it is. And I say this as someone who personally saw structured "things" on two different occasions which defy prosaic explanation.
But if you're going to say, ETs, demons, interdimensionals, nazis, faeries, djinn, Kelly Johnson, et al...you need to bring strong evidence, otherwise my theory of Bigfoot with kites stands tall.