She can be every bit as vicious and cruel as the monsters that made her. She can also be quite kind if the mood strikes her. She was human, she still had humanity for goodness sake for better or for worse. She was Hermione still to a few of her other friends that were still alive. Ronald came from a pureblood house, his family was large and they had little time for him. They were considered Blood Traitors for associating with people like her. But he understood her wishes, her need for revenge, and equality. He is backing her for the sake of Harry.