The biggest imperative as far as school management was concerned was to avoid parents making complaints. Good kids rarely told their parents if they were unfairly punished as part of a group, and even if they did, because good kids normally have good parents, they were unlikely to complain at the drop of a hat. Bad kids who perceived even the slightest trace of injustice, real or not, would be straight home complaining to parents who’d be straight up to the school to yell at the school for ‘picking on my Jake all the time.’
It is an incredible luxury to be teaching in a school where you’re expected to maintain discipline, with punishment if necessary, and where parents are nearly all open to the idea that maybe sometimes their kid isn’t the one in the right, and only make complaints if they really think something is genuinely wrong, and when they do are seeking conciliation and a resolution, rather than just wanting to beat up the teacher.