Why are ghosts creepy?

Why are ghosts so strange in a creepy and dangerous hostile way? Isn't it more logical if they act like normal humans who are alive? I mean ghosts are just dead humans.

Why do ghosts often act like creeps such as them doing these things below:

  1. Having scary or strange physical appearances or forms

  2. Moving objects in repeating patterns with no functional purpose

  3. Menacingly staring and smiling at living humans without saying a word

  4. Attacking or killing living humans for no reason

  5. Possessing the body of the living for no reason

  6. Speaking in a weird way

And the list goes on.

Honestly, ghosts are not scary because they are supernatural. They are scary because they act like psycho crazed freaks with ill intent. The fear of ghosts is not really the fear of the supernatural but is the same fear as the fear of living crazed solitary psycho killer humans still living today.

I think I would be okay with living alone with a ghost that violates the laws of physics as long as he or she doesn't do creepy harmful shit and act and look like when he or she was a living normal human.