"corporal punishment never hurt anyone long time." That is absolute garbage. I know that from childhood experience. I was no angel at school, but was belted by the headmaster and one teacher just for making simple mistakes, or giving the wrong answer with sums.
I grew up after leaving school with the attitude that no one had better even as much as threaten me with any violence, even my own father never laid a hand on me over the age of 12, and by the time I was 15 would have been more of a match for him if he even tried.
I can say in all honesty I was never grounded as my father would never had been able to keep me in.