"That’s exactly why we can’t!" For some reason Hermione felt extremely strongly about the whole matter, and she gesticulated emphatically as she continued. "We’ve let this war change us too much already. We’re letting  taint us; twist who we are and what we’re willing to do. We have to stay true to what we’ve always stood for – what’s right. Doing things the right way. Not doing things for the greater good. Or we’ll end up just like you-know-who!"