Personally, I know I've written fics where characters have said things that I don't believe in, but they said them because I believed it would be IC for the character. And this has happened even if the character is well-liked in the fic. It happens in RL. People who are well liked by everybody, sometimes have the most horrible views. And sometimes people don't criticize them for these views even if they themselves think differently.

I just don't think a fic should be taken at face value like that. I really don't think you should be assuming that the author believes everything her characters say. After all, not all fics are out there to teach us about ethics.