"Well, of course I did," Harry said. Dumbledore had mentioned that most wizards didn't, and Hagrid had started every time Harry used it, but Harry affected puzzlement. "I killed him, after all. But think about those terrible years," Harry said, his voice going soft in sympathy, "committing one atrocity after another...torturing dozens of people...killing innocent witches and wizards...marrying your mother..." Harry's smile grew into a smirk, and his grip tightened, though his voice stayed as soft as before. "...siring a pathetic excuse for a son so thick that he tried to bully one Muggleborn witch and then immediately befriend the son of another...and powerless to stop any of those horrible things from happening until I freed him..."