Anyone caning an entire class just to show who’s the boss was in the wrong place.
Wormwood Scrubs on Rule 45 would be a better place.
Those who punished an entire class, guilty or otherwise, or when no-one would confess? Know what the Nazis did when their Governor of Bohemia, Reinhard Heydreich, was assassinated by partisans?
Simply went out and massacred the entire village of Lidice, I believe?
One was of course a crime against humanity, but then maybe that sort of teacher was, too.