This is quite true. However, Armstrong was regarded by many (including USADA obviously) as being a figure head and authority figure of drug taking in the entire peloton, and enforcing an omerta that meant if you were a professional cyclist you either took drugs and were therefore part of his gang, or you were clean and were therefore not part of his gang.
If you were not part of his gang (see Christophe Bassons and Filippo Simeoni, Cunego etc.) and you spoke in any way out of turn to the media etc. with regard to 'a two speed peloton' or PED's you would be run out of town by Lance, not be able to win or even compete in races and struggle to find an employer for the next season because no one wanted to cross Lance, such was his influence in cycling. You were regarded to have broken the code of silence (spat in the soup) - Lance is widely regarded as being the enforcer of this rule.
When Simeoni (who testified that Lance's doctor gave him PED's) got in a break in the Tour Lance himself chased him down an told him to go back to the bunch. Because Lance was there the break would have been chased down, so Simeoni had to drop back into the bunch where he was gobbed on by pretty much everyone in the bunch. Lance gave him the zipped lips sign - as in 'keep your mouth shut'. It's all on youtube.
For the Armstrong years of the TdF journalists who knew rightly what was going on in professional cycling would not report it because Lance and Johann would blackball them from the Tour. Bruyneel had a notebook of name that weren't allowed into USPS press conferences because they were trouble makers.
If you were one of his team mates you simply wouldn't be chosen to ride the Tour without being doped.
The reason they've gone for Lance is because they see him as being the ring leader and there was absolutely no chance of clean cycling while he was around.
What I can't get my head around is that 90% of the peloton is widely regarded to have been doped when Armstrong was around, and yet now we're supposed to believe that it's largely clean, despite many of the same riders and more importantly all of the same team managers, coaches and doctors - and governing body still being in place.
Wow, I'd never heard about any of that. "Cycling Omerta"
Greg LeMonde has been hounding Armstrong for years, convinced of his guilt. Once upon a time, LeMonde was considered the greatest American cyclist, so he's clearly got an axe to grind.
I think that so many of these athletes from across the sporting world who dope, manage to stay one step ahead of the testers, it's just one big cat and mouse game. That's probably how Armstrong was able to pass so many tests.
I wonder if it was the drugs that gave him nut cancer.