"I understand your intentions, Harry," the old wizard said. "You think you have taught the bullies of Hogwarts a lesson. But if Peregrine Derrick could learn that lesson, he would not be Peregrine Derrick. He will only be provoked more by what you do - it is not fair, it is not right, but that is the way it is." The old wizard closed his eyes, as though in brief pain, and then opened them again. "Harry, the most painful truth any hero must learn is that the right cannot, should not, must not win every battle. All of this began when Miss Granger fought three older enemies and won. If she had been content with this, the echoes of her deed would have died away in time. Yet instead she banded together with her classmates and raised her wand in open challenge to Peregrine Derrick and all his kind; and his kind cannot but raise their own wands in answer. So Jaime Astorga went hunting her, and in the natural course he would have beaten her; it would have been a sad day, but it would have ended there. There is not enough magic in eight first-year witches all together to defeat such a foe. But you could not accept that, Harry, could not let Miss Granger learn her own lessons; and so you sent the Defense Professor to watch over them invisibly, and pierce Astorga's shields when Daphne Greengrass struck at him -"
The old wizard went on speaking. "Each time you intervened, Harry, it escalated matters further and yet further. Soon Miss Granger was facing Robert Jugson himself, the son of a Death Eater, with two strong allies at his side. Painful indeed it would have been for her, if Miss Granger had lost that battle. And yet again by your will and Quirinus's hand, this time shown more openly, she won."
Harry was still struggling with the notion of the Defense Professor watching invisibly over S.P.H.E.W., guarding the heroines from harm.
"And so," the old wizard finished, "that is how we came to today, Harry, to forty-four students attacking eight first-year witches. A full battle in these halls! I know it was not your intent, but you must accept some measure of responsibility. Such things did not happen before you came to this school, not through all my decades in Hogwarts; neither when I was a student nor when I was a Professor."
"Thank you very much," Harry said evenly. "Though I think Professor Quirrell deserves more credit than me."
The blue eyes widened. "Harry..."
"Those bullies were attacking victims long before this year," Harry said. Despite his best efforts, his voice was starting to rise. "But nobody seems to have taught the students that they're allowed to fight
"No, it is not," Dumbledore said. "It is not, Harry. To
"Well," Harry said carefully, after weighing his words. "I don't know if it will help to say this, but I think you're getting the wrong impression of what I'm all about. I don't like real fighting either. It's scary, and violent, and somebody might get hurt. But I
The Headmaster frowned. "You sent the Defense Professor in your place -"
"Professor Quirrell didn't do any fighting either," Harry said calmly. "There wasn't anyone there strong enough to fight him. What happened today wasn't fighting, it was winning."
It was a while then before the old wizard spoke. "That may be as it may be," the Headmaster said, "but all these conflicts must end. I can hear the strain in the air, and with each of these clashes, it rises. All this must end, decisively and soon; you must not stand in the way of its ending."