tough love

This story from Canada is about a difference between North American cultre and Korean culture. How far should parents go to punish their children? Does the state (government/police/legal system) have the right to become involved in a "family matter?" If parents pay to have their children educated abroad, what are the duties of the children? and the parents? Is there a disconnect between wanting one's children educated in a foreign country but expecting them to keep the behavoural standards of the home country? Does any of this apply to Vietnamese students?