"Ever since third year, I've been saying that the Dementors are evil," she tells them, "and after Voldemort returned at the end of fourth, I've been insisting that they ought to be destroyed. They were merciless and inhuman, and they didn't listen to reason – mere shadows of souls violently torn from the world. They tortured the Muggle-borns locked up in there during Umbridge's reign, and they feed off of everyone they can only so they can inflict more harm." She pauses, for emphasis, her eyes narrowing to a glare. "I've told you that they could be killed, but you, Harry, you kept insisting that a Patronus would be enough, and that there was no need to eliminate enemies that clearly could do nothing good."