One of my pet peeves is the attributing of statements made by a fictional character to the author who wrote the story. It doesn't follow that because a character, even a hero, says something, that the author believes the statement to be true.
It's especially irritating when the nihilistic statements of Hamlet or Macbeth (both villains) are attributed to Shakespeare. This is akin to quoting the Machiavellian moral arguments of Saruman and citing Tolkien, or quoting the lies of Satan in the Bible and attributing them to God.