What do you think about mass punishment over the actions of a few?

My gym teacher is punishing our entire class because of a fight between two girls in the locker room.
The other girls had nothing to do with it except they pulled them apart.
But he’s being “tougher” on us. We can’t play games anymore. It’s just running and stretches and jumping and push-ups. And we only get 5 minutes to change and if we’re even half a minute late, we get ISS. Which goes on your record. And he’s just being mean too. Like he made us do a relay race today and my group was the slowest and he made us do push-ups while everyone watched and called us lazy.

We’re not even the problem kids! I do everything I’m supposed to. He even made us write a paper front and back on how we should respect him. I’ve never disrespected him so I didn’t know what to write!

His philosophy is that punishing as a whole works because there’s more bad kids than good and he doesn’t want to waste the office’s time sending all the kids there for punishment.
And he thinks that punishing as a whole will cause peer pressure for the bad kids to behave.

But they don’t care!
At all. The bad kids outweigh the good kids and so they don’t care if we want to be friends with them or not.

I’m just sick of being punished and yelled at because two kids got in a fight. That was their beef, not mine. I don’t see why I should get their punishment.