Please see historical and global context related to 'police-state' and despotism in order to understand the significance of these issues. You will need to set aside your American exceptionalism.
I do have an issue with the article though. My middle school did have quite a few young criminals in it, and a zero-tolerance policy would have been beneficial for everyone. Instead, quite a lot of physical violence and theft was dismissed as 'bullying' which resulted in escalation. I know for a fact that many of the students who misbehaved in less extreme criminal ways (and were allowed to get away with it) did enter into a life of crime before they were halfway through high school.
So there is a difference between militarization and despotic control and disciplining students enough to prevent them from becoming criminals.
I think that rather than worrying about harsh penalties for vandalism etc., take issue with the propaganda being fed to students and the lack of focus on problem solving outside of narrow domains.