Trojan your right, although conclusive ev idence for spirits etc has nor been proved, there is an awful lot of documentation, photos and peoples accounts that can't be explained away either.
The same thing goes for UFOs if they don't exsist.then why the secret files, why are pilots etc swarn to silence. Respectable people have made accounts of both sightings of UFOs and ghosts etc.
We couldn't see orbs etc until the advent of the digital camera. We couldn't see stars and other planets until they invented Hubble.