A cracked skull huh? I support holding the little heathens accountable. But that is beyond extreme.
In isolation, I would agree with you - and I might agree anyways.
However, remember that school discipline is not in isolation. Many kids are brutally beaten by out of control classmates. An occasional teacher hitting a student may stop some of that. And if they were allowed to smack a kid regularly, then it might never reach the breaking point...
“A cracked skull huh? I support holding the little heathens accountable. But that is beyond extreme.”
As Alfred E. Neuman said, “Why worry?” A case can be made that the kid hadn’t used the contents of the cracked cranium, so far. And, tomorrow didn’t look promising, either.