Well... think of this way. What drives back darkness? Light, correct? In that same way, when you treat someone kindly you begin to shine a light on the dark parts of them. People need each other, Philip, because sometimes the night lasts a long time and we let the darkness cloud our vision. Weiss needs someone to help her see again. I think that just maybe, somewhere inside, she wanted us to help her get there. That's why we can't fight wrong actions with harsh words and bitterness. It only makes the night darker.