As far as I understand it, the source of human fear is the sense of danger and the unknown.
A frail little boy with only a few kind people around him will only help him in their own way, ignoring and not believing that he can see ghosts. This left the little boy helpless in the face of possible harm, and he was a ten-year-old child with little power of his own. These factors make the little boy very dangerous when faced with possible harm.
The fundamental reason for the fear of the unknown is that the unknown enhances the sense of danger. When faced with these terrifying ghosts, the audience does not know what they are going to do, whether it will hurt the little boy; the audience also does not know when these ghosts will appear. in fear of being hurt.
So we can feel that when the audience learns that these ghosts just want the little boy to help them, when the male protagonist believes that the child can see the ghost (can give protection), our sense of fear is reduced. The little boy even had a warm feeling when he helped the little girl.
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