Mmmm, I don't mind when children are in horror movies, but I don't enjoy when they are portrayed in this kind of light.
For example, I thought Orphan was okay, if you've seen it. Even though she is really an adult, she is seen as a child, and so it was really strange to watch a child flirting with someone's husband 😅
But Orphan is an isolated case, one individual doing those things. When films simply portray children as evil, it doesn't sit right. Something obviously corrupted them for them to act in such a way