I still read it as...these hypocrisies and prejudices are things that are wrong about the "good guys". And they can learn we were wrong, as Harry does with Snape; your eyes get opened wider--but never all the way. No one ever sees the whole picture, and that's why the world is the way it is.

Hmmm. Yeah I can see that. That's fair. I don't know if I think she did it on purpose, but it doesn't matter (you know how I feel about authorial intention anyway). It still bothers me quite a bit for a number of reasons, but I can see how emphasizing that reading actually makes the problem with the triteness of it more palatable.