Even if the author is not trying to educate with what he's writing like "Peter and the wolf" might well be doing, stories exemplify human interaction. They teach about "good" and more importantly "evil" so the reader or listener can recognize it when he sees it in the real world. But authors almost always try to write believable stories which implies they have to use plausible characters and take an effort explaining the character if it's outside the society's norms, by which stories always educate about society and norms.