The parents should let the boy loose and make his own mistakes, but it is their decision. They are still the parents. Instead of going against them, ever thought about these words? "I absolutely agree with you that there is a problem with your son's behavior. However, I disagree with your response to it. BUT, you are his parents and I/we are here to help in any way we can. We have heard that SCL is abusive. Have you checked it out? Have you looked at other alternatives? Are you open to hearing about other alternatives? If yes, I/we would love to help you look into options. If no, we will butt out. It is your family. Just know we are here for you if we can help in any way." If conversation doesn't work, try a KIND letter, not an accusatory one. Offer support, not battle. You might be surprised at the response.