Many things frighten humans instinctively. The fear is natural, and does not need to be reinforced in order to terrify. The fears are species-wide, stemming from dark times in the past when lightning could mean the burning of your tree home, thunder could be the approaching gallops of a stampede, predators could hide in darkness, and heights could make poor footing lethal.
The question you have to ask yourself is this:
What happened, deep in the hidden eras before history began, that could effect the entire human race so evenly as to give the entire species a deep, instinctual, and lasting fear of pale beings with dark, sunken eyes, razor sharp teeth, and elongated faces?
… Just be careful out there.
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