Players in every sport have always looked for an edge. There's a saying that I think I've heard in NASCAR, which is "if you're not cheating, you're not trying". In baseball, we've seen corked bats, spits balls, amphetamines, and then steroids followed by designer drugs. In football, we've heard of everything from taping opponents' practices to overinflating / underinflating footballs, to lots and lots of steroids and PEDs. It's probably fair to say that in every sport, a lot more athletes are juicing than are reported.
Is there an argument that certain PEDs should be legalized and monitored, rather than strictly forbidden? There are at least a few arguments in favor. They can help injuries heal faster. In fact, I think that healing is one of the foremost reasons guys use. All professional sports cause significant wear and tear on somebody's body. Even beyond the season-defining injuries, there are muscle aches, bruises, etc.
It also levels the playing field. Everybody would have access to similar care, without being accused of cheating. Players wouldn't be faced with an ethical choice about whether to break rules to keep up with their peers. At the same time, players would be receiving prescription drugs, presumably with all of the quality control that goes into them. They wouldn't be buying sketchy, illegally-sourced drugs.
And lastly, it would end some hypocrisy in sports, where certain players are treated as "clean" and others as "dirty", without a lot of evidence. It would also show fans that PEDs alone don't make a player great.
(Inspiration for this thread today: watching Roger Clemens give pitching analysis during Sox vs. Yankees. The man's mind and attention to detail is other-worldly. His thoughts on technique and mechanics just show he's absolutely brilliant, even among his peers. Additionally, he had a legendary work ethic. He is one of the top-two pitchers of his era, along with Greg Maddox. And yet, a lot of fans are reductive, thinking he simply juiced his way to greatness.)