Well,
I think his point is that people with mental illness who dope are being advised to take downers/opiates in order to alleviate some of the side-effects of the doping agents. My big thing with doping is that we do not know the long-term health effects of altering your basic body chemistry and/or physiological genetically determined levels. To anyone who defends doping, I have often wondered if they had a son or daughter, who was clearly talented enough to compete on a world-class level, but needed to risk their lives doping in order to remain competitive because everyone else was doping, would you support doping then?