Why most people get Scared of Ghost than Psychopaths?

I guess because of the theory that a thing can have more impact in one's life when it's intangible, just like a ghost. We're scared because ghost can move unexpectedly, in unseeingly stealthily quick movements. We're scared of what we can't see. But unlike psycho's, we can see them, we can touch them, we can form some quick defenses before they attack because we see them. And that's how I conclude this topic.

I fear the physical beings much more than ghosts.