I don't understand what you are disagreeing with in his post?
He didn't deny that severe abuse is much worse? He just commented on his stance on the subject probably came from the fact he was abused as a child. Someone who was actually abused would take a strong stand against any kind of physical discipline to a child, it would be natural. He then went on to explain that because of this unfortunate past, and that he has this strong view against it, it makes it difficult for him to see that a 'smack to shock' does not tantamount to abuse. Where as people who were not abused and were smacked, do not see a 'smack to shock' as abuse. As they were not abused.