Regardless if he dopes, has doped in the past, or has never doped (which nobody is going to prove conclusively on this board today), that he has won Tour 6 times and it in a position to do it a seventh is pretty lucky. There are so many opportunities for crashing badly, like the sprint finishes were people are wrecking in the middle of the bunched up pack. That, and the pretty much perfect execution of strategy has helped him win.
While not for the purist, it would be interesting to see what benefits might be the medical world if doping was permitted. You'd have the pharm companies breeding uber cyclists in test tubes. Lance Armstrong, strain IIV, sponsored by Glaxo Smith Kline.