Sadly, most folks confuse UFOs with aliens.
BIG difference. There have been many UFOs which turned out to be test missions for secret aircraft, balloons, weather phenomena and other things. Things which are unusual and inexplicable when first viewed.
And many which are still unidentified.
Not everyone who mentions a UFO is implying an alien origin. In my opinion, UFO matters are legitimate. Reports of UFOs are legitimate. Wondering what a particular UFO was is legitimate.
Alien stuff isn't.
Arf