When people ask whether or not they believe ghosts or aliens exist, they typically point to something that is somewhat tangible as proof such as “the government says it is real” or “this video explains it all”. I think these responses are valid, but with low confidence in what they’re trying to prove. A government can simply be making stuff up and a video explaining it could of simply been misinformed into some false truth.
On the contrary, I think they exist because of statistical improbability. I see that there are an uncountable amount of videos claiming to have recorded proof for ghosts and aliens. Assuming that 99% of them are hoaxes, clout chasers, or misidentified phenomena, that still leaves 1% of all those videos to be true. As long as the percentage is not 100%, it means that there is solid proof out there, weak in confidence or not, it’s a lead to the truth.
Ghosts expire once they complete their unfinished business. So any Neanderthal ghost around now would have to be spectacularly incompetent. Despite their popular reputation, Neanderthals were quite successful in their survival strategies.
Dinosaurs can’t be ghosts. They can become zombies though.
So basically we can understand ghostliness as a property of the tool using hominids, and almost exclusively those which have developed civilization.
Personally, I don’t believe in ghosts but their existence doesn’t depend on my belief.