He was the worst kind of manipulator there was. At least Voldemort was up-front about what being part of his dark army entailed. They got to kill Muggles and Mudbloods, rape and torture people, and purify a world that they thought was impure. Certainly, she hated the Dark Lord with every fibre of her being, but she found the Headmaster, too, had awoken a very different sort of hate within her.