I remember years (more like decades) ago there was a problem with "mainstreaming" some kids - they were disruptive in class, talked, made noise, didn't stay in their seats, etc. And the teachers were NOT allowed to discipline them - they were "ill."
HOWEVER, if OTHER kids started behaving the same way in the same classroom, THEY could be punished. Even if the disruptive kid pushed or smacked another kid . . . there was no punishment, and the other kid wasn't allowed to push or smack back.
Guess how that worked out.
Now this cr@p is surfacing again.