I wanted to make Karin a neutral character, but I can't really see that working down the line (I'll still give it a try, though). I just don't see how anyone could really be neutral in this situation; it's not like V for Vendetta where you can see good and bad in both total freedom and total security. Either you support the murder of muggles, muggle-borns and half-bloods, or you think it's a really evil thing to do.