Katherine looked right into me with those fierce chestnut eyes, pinning me in place. "You're not your father." Her voice didn't have its usual sharp edge, and for once she almost sounded soft. She gently raised her hand and touched my cheek. Our lips weren't even three inches apart now. "I know you're not. You're good, and thoughtful, and kind. I know that. Even if no one else can see it."
It's the Muggle world so he couldn't do magic without breaking the Statute of Secrecy and even if he could, he's a pansy and would never kill. I mean, from the moment he found out he had to kill VOLDEMORT he was like "oh no" and he only disarmed him in the end anyway. Hermione however, would come out on top.