Bad teachers don’t kill students, and when they do, they are not shielded from justice. But other than that, I totally see your point. Well made.
Red herring. Union's and their abusive manner is something that is not recognized by the Left. It's a well known fact.
The trick is to say what you said when comparing it to the police union and in another context of unions in general you would say things like who gave you weekends.