Kids are scared of different things as they age.
Some parents take their kids to R-rated movies.
Even if they're watching cartoons, they can be scared by animals, monsters, physical transformations, natural disasters and loud sound effects such as shrieks or screams. Violence is also scary, especially if parents or children are victims. The pictures they see on-screen can scare them, but they have more cognitive skills that help them begin to understand that movies aren't real. Violence or the threat of violence still scares them, particularly when the victim is a child. The sense of danger to the world around them, which could be from aliens or occult forces, is scary.