Ghosts do exist, it's not an opinion, they do exist. It's just that millions of faked or photoshopped photos arise almost every minute so it is hard to believe that ghosts do exist. I mean some are just obviously fake. There are some spiritual medians, like Derek Acorah, from the popular show Most Haunted. Even though he has been proven fake, his techniques are those of a legitimate median. Some people have that ability to sense ghosts and supernatural beings, its as much "I'll believe it when I see it" as psionics is. It is possible. I know SF it is hard to believe that something that as "odd" or "unrealistic" as ghosts can actually exist, but they can.