She supposed her self-hatred was warranted in her careless use of the original Memory Charm on her parents. But the way Kingsley and Percy manipulated her was something else entirely. They may have gotten what they wanted, but Hermione refused to let them win in her view. She wasn’t going to continue blaming herself for falling into their blackmail scheme. She would claim no responsibility for the "side effects," after all, as the memo so vaguely put it. So if Draco Malfoy just so happened to be unaffected, so be it.