You're forgetting that public school also exposes you to more adult assholes, including ones with direct power over you that can screw you over for no reason.

It's important to know how and when to advocate for yourself and others, when to escalate through proper channels and when to escalate outside of proper channels, and when to back down and let them be an asshole because they're frankly not worth your time.

In particular, learning "pretend to lose now, win later" is a useful skill. But I think there are healthier ways to learn that skill than on a live-fire course.