Good point.
At my high school we had a 5’6” Italian Dean of Students who would have made Rocky Balboa back down. He taught social studies and in my 9th grade class with him, I watched him slam a kid into a glass wall (luckily it was safety glass) over a discipline issue. The next day he had the boy apologized to the class for wasting our time.
No one EVER messed with Mr. Cinelli, not even the parents.
I don't think we're in a better state of affairs now. The breakdown of respect of authority frankly frightens me. I even hear strains of it here on FR, people saying, "well if that were MY kid, the teacher would..." or "I would tell me kid to tell the teacher to stuff it..." or " I would encourage my child to break that rule..." Kids hear these things and it feeds in with the disrespect.
One thing I realized years ago is this "Softball is life" Follow me - If I talk about my child's coach in a negative way at home, double think his decisions, criticize his choices, second guess in front of my child, she steps onto that field with less respect for him and it will show up in how she works with him. If I have a problem with her coach (and I have many times) that is a private discussion between me and coach but in front of her, I am positive and encouraging her to think through his decisions and see how there is good in them. The principle is the same with school. If parents talk down the teachers and principals at home, the kids walks through the door of the school with that disrespect ringing in their minds. The result? A breakdown of performance in every area where an authority figure is present.