I suppose that was a rhetorical question, but I'll answer. No, that's not what to read into it. Rather, the rewards of competing at the top level are so high in any popular sport that it is hard for any sportsperson (thinking of the future, home, kids' education, etc.) to resist anything that gives an edge, whether it is altitude training, a psychologist, blood storage, or drugs.
I'm sure nearly every person taken individually would not take drugs given the certainty that others will not take them. But they never have that certainty, so it's human to reason that it is unfair on oneself, family, etc. not to compete on level footing.
Plus of course there may be some greedy cheats, like any other walk of life, but not all of them. Most are stuck in a kind of tragedy. There are parallels with overfishing and the problem of "tragedy of the commons"; every individual would rather not do it, but not doing it would create a disadvantage for that individual relative to the others, in the absence of a very good framework for preventing the others behaving in the undesirable way.
