If my kids did that I’d be perfectly fine with them getting kicked out of school or even if the teachers wanted to press charges.
Just a reminder that these are middle schoolers, if it were your kid, and a teacher decided to sue, it would be you getting sued for the behavior of a child you didn’t raise correctly.
So don’t try to take the high road here. If your kid did something like this, it would be because you were a shitty parent who didn’t teach them basic right and wrong.
“I’d let the state punish them on my behalf” is just revealing the issue: you expect other people to raise your kids.