In a letter he writes that he did "not feel even the hint of an obligation to an entity called READER" (145). But later you witness his softening: "I feel like I have changed, learned so much about what good writing ought to be" (158), as he ultimately breaks forth into, as ...
The main character can walk away with a new understanding, perhaps one stated by a mentor. While giving a character the last word on the matter emphasizes their viewpoint, that alone is not enough to grant them authorial endorsement. Other aspects of the story have to support their position....