I think this is partly about giving yourself an out for liking childish things as a near- or young-adult. Kids shows commonly do include some Parental Bonus but extending that idea specifically to dark undercurrent plots that you have to read between the lines of the text seems like a way to feel “in the know” about something adult in the work while still consuming something you feel society expects you to have grown out of.
Then with a bit more maturing than that, you can hopefully just embrace childish joys earnestly, because joys are precious.