While true it was Michael's choice to abuse drugs, this does not mean that his suppliers should not be sent to jail. Just like any dealer in the street does not force an abuser to buy crack and abuse it until they kill themselves...they still peddle something that is illegal and causes harm and are sent to prison for it. While some of the drugs may be legal for a doctor to obtain it is not legal for them to dispense it like a common street pusher. They have a responsibility to their client and their profession to first do no harm. There is no way that anyone had Michael's best interests at heart. They all saw it as a payday and if they didn't get it for Michael they knew that someone else would. They opted for the payday, and now may pay with their freedom or at least their medical liscenses.