I wouldn’t want to live in a world without ghosts. There may be no such thing in this world, but that there can be doubt makes the dull reality a little more magical.
Too many people think science’s job is to rob all mystery from the universe, to know all that is knowable. How horrible for them, then, is it to learn that there are things that cannot be known! A particle’s position and momentum, for example, cannot both be known at the same time. There will always be something unknowable.
How horrific, how utterly terrify this must be to the mind that cannot accept that there are ghosts and shadows that can never be quantified. The randomness of reality and the quantum nature of the universe are the ultimate horror show to the dogmatic mind that says nothing is true that cannot be measured, understood, and cataloged.
This is fear, not rationality. Fear of the unknown, of the unknowable, the opposite of reason and logic. Places where the rules no longer apply must scare the living daylights out of the people who can’t accept that the human mind cannot comprehend all of the fundamental mysteries of the universe we live in. Can there be a god? Perhaps. Can there be ghosts? Also perhaps. Nothing can be ruled out when there are unknowable rules.
And so we live in a world where there can be ghosts, where the known and the unknown coexist, and our feeble understanding is a dim candle light in the darkness of the unknowable void.