"You can't think of them like that, for starters," she said, with a vaguely sad smile, "Or you'd be throwing yourself off a building with in the span of a week."
Her fingers curled absently around his, and her eyes drifted off. "When you see enough death you start to get used to it. Everyone else will see you as a heartless monster, but honestly, if you let yourself feel for everyone of them you won't be able to live with yourself. You just have to learn to forgive yourself. You won't forget. It wouldn't be right to forget them, but you have to forgive. It helps if you can say it was for the greater good. Though really, some of the things I've killed for...they really didn't make the world that much better of a place to live. More convenient sometimes...but not a better place."