Because we don't want a world in which athletes have to destroy their bodies in order to be competitive. ETA: And let's be clear, that's exactly where it leads

Because we don't want a world in which athletes have to destroy their bodies in order to be competitive. ETA: And let's be clear, that's exactly where it leads. People will feel compelled to start doping younger and younger, when they can do more and more damage to themselves (like giving themselves testicular cancer) -- young people also have poorer judgment about these things. We've already seen all this happen.