Wiggins has always been pretty sound on doping: in 2009 he conceded that public suspicion was reasonable ("I came from nowhere on the Tour and everyone knows where it's been with blood doping") and he made his blood passport figures public, which I think was brave.
He was magnificently outspoken in his 2008 autobiography:
"You bastard Landis", I thought. "You have completely ruined my own small achievement of getting around the [2006] Tour de France and being a small part of cycling history. You and guys like you are pissing on my sport and my dreams. Why do guys like you keep cheating? How many of you are out there, taking the piss and getting away with it? There is me trailing home 131st, and for all I know, I might be a top 50 rider if we all started on a level playing field. Sod you all. You are a bunch of cheating bastards and I hope one day they catch the lot of you and ban you all for life. You can keep doing it your way and I will keep doing it mine. You won't ever change me, you sods. Bollocks to you all. At least I can look myself in the mirror."
(RossBD, would you describe this as "cynical whining"?)
Now that he has the yellow jersey and his press conferences are reported worldwide, he has a chance to get his views on doping into the press and make a small difference. That's why I think it's a shame that he seems to be doing an Armstrong. But it's just one outburst and there will be plenty of opportunities for him to do better.