Many young writers start out with the idea that a story is a place to express their views—to tell the world what they believe. That is, they understand the story as a delivery system for their ideas. I know I felt that way. A story was where I got to set the world straight and achieve glory via the sheer originality of my advanced moral positions.
But, as a technical matter, fiction doesn’t support polemic very well. Because the writer invents all the elements, a story isn’t really in a position to “prove” anything. (If I make a dollhouse out of ice cream and put it in the sun, it doesn’t prove the notion “Houses melt.“)