This is the purpose and function of story: to show that when something has previously served you well one hundred percent of the time, it may not continue to hold true, or conversely, that it will always hold true. Either message is equally valid and depends wholly upon the author’s personal bias on the issue, which arbitrarily determines the slant of the message. Obviously, the outcome is not arbitrary to the author, but it is completely arbitrary to the story.
Whether the Main Character is change or steadfast, the outcome success or failure, and the judgment good or bad, determines the audience’s position in relationship to the correct and incorrect approaches to the problem, and therefore the impact of the message upon them.
From the Dramatica Theory Book