Not sure what your "expertise" is in this area, but there isn't a single study (based on real live people and children) that proves the benefits of using violence on young children, particularly those who have already suffered huge trauma (both mental and physical) in their lives.

You justify your point by saying "A person cannot respect someone ...", conveniently forgetting that we're talking about a 9 year old here - not a fully-formed adult person. You are attributing (very questionable, IMO) adult traits to a 9 year old.

In the real world that doesn't work. Fortunately most of the commenters on this thread seem to recognize that.