My athletics coach used to say that no man can run 100 under 10s if he's not using something. The difference are that some use doping in pre-sason training in order to train harder. Some use new, still not banned substances. But all the top athletes use some doping.
This doesn't make their success any less. With doping it doesn't get any easier, you just go faster. You still need to train very hard, do good when the race starts, push yourself. If you add the fact that most competition uses doping, you're practically going handicapped if you stay clean.
I admire Lance, inspite of doping. Hard training, racing, will to win - it's all there. As it was before. The world is not black&white. Pro sport especially.