I think the show, Intervention is, like most things these days, carefully staged. I read somewhere, don't know where,that interventions are not wonderfully successful. Seems accurate to me. No one can make someone change their ways, we know this. So why would a bunch of people telling you how much you have screwed up make you want to quit your DOC? With me, it would have had an opposite effect.
In fact, I was listening to a recovery podcast today, "The Bubble Hour," where the person telling her story told of her parents staging an intervention for her when she was 20. She blew them off and went on drinking and drugging for 6 more years. She stopped when she found a therapist with whom she could work productively, and then started going to AA.
Anyway, my two cents, fwiw. Peace.