I'll put the reference to the essay on my livejournal, but it's in issue 19 of Scribbulus on the Leaky Cauldron website. It's got quite a few comments (which I think was their intention) - mostly supportive, but the first one might interest you. It's from a retired teacher who does not find Snape's biased treatment of the pupils at all acceptable, and therefore cannot go beyond brave as as compliment to him. I find her position hard to understand, but I suspect that it is possibly very like JKR's.
Reading your essay once more (at 5.30pm), I do see somewhere that I do disagree with you. You say that she does not comment on power in the wizarding world. I think that she does - just not very subtly. People who want power get sorted into Slytherin - that's why all Slytherins are so nasty, because they are power-hungry gits. As Dumbledore says, somewhere amid the mutual back-slapping in King's Cross, power should instead be given to people like Harry (and why not? Shouldn't everything be given to people like Harry?) because, as they do not want it, they can use it. As I said, not very subtle!
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Reading your essay once more (at 5.30pm), I do see somewhere that I do disagree with you. You say that she does not comment on power in the wizarding world. I think that she does - just not very subtly. People who want power get sorted into Slytherin - that's why all Slytherins are so nasty, because they are power-hungry gits. As Dumbledore says, somewhere amid the mutual back-slapping in King's Cross, power should instead be given to people like Harry (and why not? Shouldn't everything be given to people like Harry?) because, as they do not want it, they can use it. As I said, not very subtle!