"History is written by the winners -- and interpretted by the wieners!"
Frankly, I think the idea I expressed above can apply equally well to fiction, as well as history. Think how different a story like Cinderella would be, if it were told from the point of view of one of the stepsisters, or "Romeo and Juliet" if it were told by Mr. and Mrs. Capulet (or Tybolt).
Which is why, Guest, my mother always told me to: "Consider the source" before forming an opinion of anything someone said to me.
And there's always the Irish proverb: "There is no worth to a story without an author."