Note to Self:
You're wrong when you say, "You have to pick your battles," when referring to your students. The truth is you never want a battle. You don't want a war. You don't want shrapnel wounding students and you don't want attrition taking innocent lives. So, don't choose your battles. Instead, remember that you're fighting for them (even in discipline) because ultimately the real wars are poverty and racism and injustice and ignorance. Those are the battles you need to choose.