I just read an interview by David Walsh about Armstrong, and this was said.
"Because we have to know if the guy who won the Tour de France seven times is a genuine champion or not. Because in my view, if he doped to win the Tour de France, which I believe he did, he’s not a genuine champion. And other people will say, "Oh well, most of the other guys who rode those Tours were doping, so therefore he was the best." Well, I don’t subscribe to that view. My view is that there were plenty of people who rode those Tours clean who were absolutely screwed by the system, and if we don’t stand up for those people we shouldn’t be in the jobs we’re in."
I completely and utterly agree with that quote in the sense no matter how many people where cheating it doesn't make it right.
That whole interview he does is brilliant, admittedly it was before he was proven to be guilty (we should agree to disagree on that one).