The documentary Bigger. Stronger. Faster. is really entertaining and has a pretty balanced look at all of this. The documentarian looks at a lot of these inconsistencies such as taking a PED, vs blood doping, vs altitude training, vs hyperbaric chamber. All do the same thing, 2 are legal, 2 are not.
Other strange contradictions exist like tennis players being able to openly take cortisol shots (a steroid) but not anabolic steroids, etc. After all, if your knees can't take the beating shouldn't that be a determining factor in whether you win or lose?
And of course why is performance enhancement unfair in sports but not in life. Orchestra musicians take drugs to calm nerves, students take drugs to focus and study for the SATs. If someone gets a job instead of you, or accepted to a university instead of you because they took a drug and you did not, is that fair?
The documentary debunks many health concerns and I always hate that myth that the drugs are the cause of an athletes success. At the elite levels we are talking about the winners are already at peak performance through loads of hard work and willing to take substances to push it .5% more as these contests can be decided by hundredths of a second.
I'm definitely anti drug, but on a lot of this issue I'm surprisingly open. I have a hard time differentiating between a steroid or PED and a lot of other modern sports science and nutrition.
That being said it's definitely a professional level, adult decision. Seeing it in any kind of youth sport is troubling.