The article poses it as a question, but the answer is evident - it's a culture problem. Not 'South Korean' culture, but specifically the culture of relationships they've allowed to develop between parents and teachers.

A good education comes from a collaboration between parents and teachers. Parents are ultimately responsible for their child's education, and teachers serve as helpers pursuing that. A teacher's authority is delegated from the parent.

The parents mentioned in this article appear to wish to train their children to treat them, their teachers, and others with harassment and disrespect. If a teacher or school system isn't willing to help them in that endeavor, then they are pursing different goals - it's not a relationship that can work. One of the parties in that relationship can and should leave to go do something else.