My immediate reaction is that I remember hating it very much at school when a teacher punished the entire class for the transgression of an unidentifiable person!
Same! I thought about putting that in as an example, but didn’t end up using it.
Just a side note. During my time in the Army it was always noted that group punishment was not to be imposed (outside basic training but I think that was a separate situation). I always thought that as a bit odd given the need for the unit to function as a whole. One might think that such an approach would promote more unity by make each unit member essentially their brother’s keeper (and cell mate as it were).
The only way I could understand the point—outside the innocent should not be punished aspect—was that such an approach was likely to both disrupt unit cohesion and trust as well as allow one disgruntled member undermine the entire unit.
I’d be very interested to know how that rule came about.