I can see it now
Me, "Mom, billy pushed me and poked me with a pencil."
Mom, "Well, did you whip his azz?"
Me, "I told the priciple."
Mom, "Was that before or after you whipped his azz?"
Me, " I just told the principle."
Mom, "Well you little chicken chit! now when you father gets home he's going to whip your azz!"
You see, it's ok to tell the principle, as long as it's while explaining why you whipped another kids azz.
Of course they didn't look to involve the cops for a school room fight back then.