You’re refering to a case of a little kid. 99% of us would agree that in that instance a potch is necessary.
What I’m referring to is more of a grey area, like a 12 or 14 year old who acts up. There, parents need to think twice.
Beyond age 16, you’re really up a creek. In fact, chances are, petch at that point, petch may even be counter-productive.
But I still hold my ground on the “no-potch rule” when it comes to school staff, regardless of the age. Unless its in self-defense, there are no grounds for them to raise their hand. Ever.