UFO interest in nuclear power plants and weapons installations is well established, with some incidents of nuclear missiles being deactivated or started toward count down. Notably, the explosion of nuclear weapons in war and in testing would likely have prompted interest in Earth as a nuclear power. Even if UFOs are immune to all other human weapons, a hit from a missile with a ten kiloton nuclear warhead would no doubt be destructive of a UFO.
Along those lines, in the immediate post-WW II era, it was at Roswell, New Mexico that the USAF based its nuclear-armed B-29s. No wonder the place seemed to attract interest from UFOs.
By one account, the US policy of UFO secrecy was based on John von Neuman's insight that UFOs seemed to prefer secrecy, so changing that policy might prompt them to become aggressive. Supposedly, with new weapons now providing the US and Earth with a self-defense capability, UFO secrecy is gradually being relaxed. The release of the Navy UFO videos and pilot reports seem consistent with that explanation.
I’m sorry but there is no real proof these things actually exist. Unidentified flying objects are just that, unidentified. I know all about Roswell. In 1981 I bought a book called “The Roswell Incident’’. I believed in the things until I developed an interest in astronomy. I’m sorry, but until one lands on The White House lawn I don’t believe in them anymore.