This puzzled me. I read it again. Yes, this person is angry that the story ends in sadness. Why, this is the whole point! This story, albeit fiction, is depicting life as it is. Not as it ought to be. This is writing! Writing with talent, with skill, with emotion and aesthetics all at play. This is moving the reader, moving the world with words alone. This is the heart of literature; what it can do and what it should do! Move something, do something, be something all on its own by its own heart.