Why do we afraid of Unknown?

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Why do people loved to be scared so much? If a ghost was to come into my living room what is the worst it could do?make me dead too? people love blood, horror , ghost, cemeteries,haunted houses, spooky sounds, hauntings and twisted plots. It can't just be a fear of the unknown. why do you think people love to be scared? do you love to be scared? why?