I'd hardly call my somewhat offhand statement a "rant," and I rather think the "Black Council" discussion you linked to is more of a morality dispute than a political one. And even though morality arguments spiral out of control even faster than political ones, I think that historical analogies can be valuable when commenting on morality in the books.
I agree we should avoid getting overtly partisan and devolving into political arguments. I've already apologized for the statement you linked to, as you and Belmonte were right when you said that such comments have no place on the book discussion boards. However, as politics is playing an increasingly large role in both series, Dresden and Alera, I don't think we should ban political commentary altogether.