Unfortunately, it has nothing to do with it. Especially since most cyclists are probably doped. The reason why everyone is so harsh on Armstrong is because he was always as ******* about it.
He was tested positive once, and gave the doctor's paper after the results were given, which is strictly prohibited. No idea why he got away with it. Probably because he's a well known figure.
He threatenned another athlete who wanted to talk about doping in cyclism.
He insulted (suing under way) someone who said Dr Ferrari (a personnal Armstrong friend) was giving doping products to every athelte he knew.
He actually raced in a TDF stage and made his team chase that italian cyclist for a personnal vendetta.
He said he's never seen a doped athele in his life even though plenty of his team's atheltes were proven doped. The doctors of his team were actually seen with doping products, etc...
The guy is a liar and is arrogant.
You'll learn every detail and some of them are really incredible right here if you can understand french :
http://cyclisme.dopage.free.fr/portraits/armstrong.htm