It seems to me in this particular case the father did no wrong - he is the one that did the job the school administrators failed to do.
When an article about this first appeared my 4 word response was "Lock'em all up".........the administrators and the youthful perps.
I agree the father didn't (as far as we know from the available information) do anything wrong. I was just pointing out that, if this had happened to my daughter in my back yard, I'd be toast ... but these administrators and teachers will likely suffer no permanent career damage. Even if the principal is fired, do we really believe that will end her career in education? I sure don't!