Schools let their students walk out of class to protest, without punishment. Are you saying that didn't happen?
Either way, this story reminds me of a fantastic 10th grade teach I once had. The best lesson I ever learned was one she'd be fired for today, saddly. We were studying WW2, and the rise of the Nazi party, and the start of severe anti semitism within Germany. And the question came up, how could otherwise civil people be so evil to the fellow humans? The next day, her lesson was delivered. She gave us a pop quiz, all multiple choice, all impossibly hard questions, as I recall. Thought for sure I bombed it. We went to lunch, came back, and she had them graded, at which point, she announced, congrats, almost ALL passed, but ONE person failed, and went on about how disappointed she was in this person, etc. Then, she called the student out. It was terrible. Her name was Anne. And she started to cry. And all of the rest of us sat there, doing nothing. She ended the lesson, I figure, just before Anne had a complete break down, called her over calmed her down, then told us that the quiz was bogus, we all failed, and in addition, we all sat by and did nothing as an authority figure singled out and bullied a fellow human, breaking clearly defined morals and ethical guidelines.
It's a lesson I took to heart, and has affected every aspect of daily life. And if a teacher ever tried it today, they'd be fired so fast, there'd wonder if they ever were a teacher in the first place. Sad, really.