They went through the same argument several times, because Hermione, brilliant though she was, was only twelve, and she did not understand. Even when she did start to understand, she rejected it, because when you're a Muggleborn witch and know how to read between the lines of history books, you know that the magical legal system doesn't care what your parents have to say about anything, and that the teachers at Hogwarts can't help you. You know that Lucretia Black-Prewett murdered forty-seven Muggleborn children and never got tried for a single one, and that she didn't stop when You-Know-Who died, and vigilantes had killed her in 1984 because the system didn't do a thing, and she wasn't the only one. That wasn't the kind of thing that would just go away if you tried to go to a Muggle school instead. When you knew that sort of thing, the idea that you weren't responsible for your own safety felt very weird for Hermione. But she tried to explain this, and was told she was being silly, and when they got home, Hermione, for the first time in her life, stormed up the stairs into her bedroom and slammed the door.