Either Japan is radically different than the US... or the author is trying to really piss people off with a stupid story point. Like I tend to ignore "minor" things but stuff like this totally just shatters that sense of disbelief you need to have to enjoy reading things. If any teacher did this it would be an open and shut lawsuit against the school (By US standards the only ones I know) so either I'm up against a cultural gap I can't bridge or I'm unable to accept the thought processes of the author.