ugh. this response always gets to me. People training on drugs is different than people training w/o drugs. The recovery is different, the response is different, the access is different. You have NO idea who would have won the tours in question had everyone been riding clean. Just because Lance was a tough SOB in the mountains with the aid of drugs (allegedly), does NOT mean he would've been one without them. Just because he got to the starting line healthy, injury-free and ready to destroy people with drugs (... allegedly), does NOT mean he would've gotten there without them.
Besides, we now know that members of his U.S. Postal team were definitely doping, as they've been caught. That's like a member of a relay team cheating in track in my book. The Tour is a team effort as much as an individual one. Lance was put in a position to win by at least a few dopers that he trained with and depended on in competition.
Believe what you want about Lance, but those Tours were won by a team that was definitely not clean:
http://www.cyclingnews.com/news/former-us-postal-riders-admit-epo-use