Athletes, Superheroes, and Doping

I had a glorious 16 days watching the Olympics. To me, the athletes seemed like superheroes. Usain Bolt ran faster than anyone and looked like a Greek god. Michael Phelps swam an amazing variety of swim strokes and was the master of each of his events. I did not hear too much talk of doping like I usually do for the Tour de France. I mean, those guys ride their bikes for 3 weeks, over 150kms daily, and with only two days rest! That takes super human ability. It is exciting to watch.
We like to see people break records, Barry Bonds was a champion home run hitter, but he was caught doping, Marion Jones was an amazing sprinter, again, doping, Floyd Landis, winner of the Tour, caught doping.
However, we like superheroes, at least I do! I like to see people do amazing things.
I popped in one of my X-Men movies and this got me thinking about the evolution of the human body. Of course, in X-Men, the abilities are extreme and the evolution of these abilities came quickly.
I began to ask myself, if we like seeing action heroes winning or defeating the "bad guy", then would not sports enhancement be a form of human evolution albeit induced?
If the athletes were allowed access to enhancements that would not harm the body but make it faster or stronger, would that not be a good thing?
I really don't know the answer to this question except that I think human enhancements for positive purposes would be a good thing.