Yes, I think there are instances where physical punishment is a reasonable thing a parent should be able to do. Children are diverse individuals who all learn, adapt, and react to different stimuli and methods of teaching/corrective action. Is it possible to go absolutely overboard? Yes, yes it is. However, it's similarly very easy to go overboard in terms of the reaction towards any level of physical punishment. But we live in a society that more and more has to box everything into little extremes as a means of being able to get on ones high horse and declare oneself superior.