I believe in spirits, not ghosts. I believe spirits are dead people, angels, and demons.
I think some people can experience them and others can't.
I think its semantics. as they are all spirits. ghosts, ghouls, creepy crawlies or whatever we label them are generally the same, though their purpose and how they came to be might not be.
I was able to see ghosts growing up. Enough to know there's more than meets the eye in the world.