Something-elses of the world, unite! (p19) - Joanna Russ

SF was born didactic! It originated as a teaching medium-which is why its potential to actually effect some changes in people's attitudes is infinitely greater. It's got representative protagonists, for example-at least it starts like this in the works of H. G. Wells, Jules Verne, and other proto-SF writers. If you look at, say, The War of the Worlds, the human beings there may represent certain attitudes or types, but they are obviously not "individuals" in the sense that characters in the great realistic novels are.

In the field of science fiction or fantasy, morality—when it enters a book at all—is almost always either thoughtlessly liberal (you can’t judge other cultures) or thoughtlessly illiberal (strong men must rule) or just plain thoughtless (killing people is bad).

And you think they'll let you," said Machine. It was a flat, sad statement.
"No," she said, "but nobody ever let me do anything in my life before and I never let that stop me.