UFOs exist. I saw a white light on the night sky, I couldn't identify it. It was an object and it flew. A few minutes later I could identify it. It was an airliner.
I don't see any evidence of ETs ever having visited this planet. However, statistically, the chance of us being alone in our Galaxy, let alone the Universe, is really, really small. In all likelihood, there are lifeforms elsewhere. The probability that these possible beings have detected our radio signals is next to zero. The radio bubble is really small compared to the size of our Galaxy. Then, there is also a reasonable chance that physics won't allow interstellar travel. Sci-fi doesn't work off camera. Then again, our best theories are the best of bad ideas.
In short: No evidence of flying saucers, too little chance of anyone visiting, I'm not spending any lengthy time pondering this.
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