I don't think he's fully to blame. MJ was also in charge of his own life as well. But this doctor faciliated his addiction and made MJ dependednt on it. Even so, they knew the consequences and even if Dr. Conrad refused to give him the drug, MJ could easily replace him. That's the ugly truth about addicts--they push you away when you no longer want to faciliate their drugs. Dr. Conrad would have been better off if he walked away from this and refused to give him any more drugs but unfortunately in this world we live in, money talks...now he's payin for it.