To oppose something is to maintain it.
We read books to find out who we are. What other people, real or imaginary, do and think and feel... is an essential guide to our understanding of what we ourselves are and may become.
Sure, it's simple writing for kids…just as simple as bringing them up.
Science fiction is not prescriptive; it is descriptive.
The trouble is that we have a bad habit, encouraged by pedants and sophisticates, of considering happiness as something rather stupid. Only pain is intellectual, only evil interesting. This is the treason of the artist; a refusal to admit the banality of evil and the terrible boredom of pain.
A scientist can pretend that his work isn't himself, it's merely the impersonal truth. An artist can't hide behind the truth. He can't hide anywhere.