Anyone can believe or dis-believe anything. Whether we “think” or “believe” a certain thing is irrelevant and doesn’t change the facts whatsoever. IF THERE IS an alien spacecraft flying around out there somewhere, the occupants don”t give a flying crap whether we BELIEVE it!
Having a closed mind in either direction doesn’t help.
Having a close mind, for or against UFOs and extraterrestrials, is equally stupid.