It's not about hating children, it's about being realistic. Sometimes kids die on-screen in books, movies, etc. too! Do they hate children? Fuck no, it's part of the story. It happens. Not everyone gets a happy ending, not everyone gets to grow up to be a happy, well-adjusted adult.
Some stories are dark, some stories about the people who didn't make it. They're stories that you're supposed to remember when you're in the shoes of a character who does get to make it - those darker stories remind you that the horrible dead things you're putting down used to be people.
It's horror. It's supposed to make you uncomfortable. Horror is not a genre that is liked for putting people in their happy place. It is liked for dragging them, kicking and screaming, out of their comfort zone.
Some stories are dark, some stories about the people who didn't make it. They're stories that you're supposed to remember when you're in the shoes of a character who does get to make it - those darker stories remind you that the horrible dead things you're putting down used to be people.
It's horror. It's supposed to make you uncomfortable. Horror is not a genre that is liked for putting people in their happy place. It is liked for dragging them, kicking and screaming, out of their comfort zone.