Just about everybody, regardless of their stance, is forgetting two major things here. One: Cheating is everywhere, in every sport (including whatever team you like). Two: Athletes cheat because the fans demand it.
I'm sure you're already pouring liquid cognitive dissonance into your brain so that you forget. It's a natural reaction to realizing you root for Darth Vader and that you're Palpatine. But it's true. let's start with that first point. Playing sports full-time is one of the most physically and mentally draining jobs out there. We, as fragile lumps of monkey meat, are simply not meant to do it. So to make it through the season (and hopefully many more) pro athletes will seek any advantage, take any shortcut, and break any rule they can, not only to win, but to simply make their job possible.
Drugs of any kind are certainly one way to cheat, and still among the most popular methods of doing so. (Baseball's biggest, most profitable rivalry is nothing but juiced-up mutants in red against juiced-up mutants in pinstripes, remember.) If a pill, injection, cream, or whatever else helps athletes train longer, recover from injury faster, and stay the fuck awake during games, then sports people are going to use them. Honor, integrity, and preserving the purity of the game means jack fuck all when kabillions of dollars and all of the fan interest is at stake.
Well, they're actually all about the purity.