Just because (theoretically) the government knows (or can&#x27;t discredit the possibility) of UFOs being alien craft, doesn&#x27;t mean they know where they come from, what they want or how to stop them. Revealing that beings from an unknown origin were violating our airspace at will, with technology we can&#x27;t comprehend, doing whatever they wanted to people, messing with our military hardware, etc, and that there was absolutely nothing anyone could do about it, might create a panic and destroy that government&#x27;s credibility.