It's not the idea that Lance was full of chemicals that's the problem. We all expected that. It's the fact that his entire team was as well, bringing the health hazards to every team that wanted to compete. Lance still won a lot of time trials though, so I'd question whether he would not have been able to win some of those tours with a clean team.
Once we accept the idea of a dominant doped USPS or Discovery, it's possible that dominance made it easier for clean riders to finish the Tour. The race was controlled other than for set pieces.
I'm interested in the winners of the Grand Prix des Nations. They fall into two categories. Riders who dominated the Tour while doping, and riders who sat in the Autobus and launched occasional lone breaks which served as time trial training. Wiggins looked like he'd fall into the latter category thanks to his long solo break in the first week of 2007.
My own view of Lance is that he was a character driven by authority issues surrounding his father's abandonment, that he was always best when he had something to push against, that his testosterone level was way high after the cancer, and that was the source of his aggression, that blinded him to the ethics.
I see that his name has been removed from the Grand Prix des Nations win list. Looking at some of the other winners I think I'll keep Lance in there.
http://en.wikipedia.org/wiki/Grand_Prix_des_NationsI see Johann Bruyneel is still down for a win in 1992.