What an interesting turn of events, how a prescriber's ultimate change in personality could have altered the trajectory of so many patients. It reminds me of a situation I once had with a psychiatrist who prescribed me a lot of high dose hypnotics and benzodiazepenes even though it seemed counter-intuitive to me in terms of any reasonable goal of bringing me to a state of improved mental health, and I did wonder if it was an odd invitation to me, that if I was compelled to take myself out, of either life or reality, I should go ahead and get on with it. I didn't and eventually disposed of hundreds of unused pills that had only ever cost me minimal co-pays, but still wondered if there wasn't at least in part some more sinister motivation on her part as the overprescribing I perceived it to be didn't seem to have much positive merit. More than likely it was the simple result of badly self-monitored cognitive biases resulting from things like perhaps her client base being overtly made up of persons who may have really needed the types and quantities of medication she was shilling out to me.

Hanlon's razor: "Never attribute to malice that which is adequately explained by stupidity." (But, don't rule out malice.)

Precaryous, if you are comfortable saying, did you find him to be a thoughtful practitioner at the time you saw him? It sounds as though he may have at first developed a double life of sorts, between patients who were inherently drug-seeking and those who were not, one life satisfying his relationship with power and money and the other life, if there was one, of still ministering to the needful whether as spiritual satisfaction or merely as a front for his other life.