Oh lets not sprint finish before we get the stabilisers off!!
Cycling has indeed set the blue print out. I actually enjoy watching cycling much more knowing those that aren't clean are likely to get caught.
I can point to a fair few reasons why cycling may well be clean, all of which combined...
What's the point in going after Russia while allowing other tarnished nations to compete?
Moving the problem won't eradicate it, as proven by all the East German coaches popping up in Beijing x years before their most successful Olympic medal haul.
Athletics has so much institutionalised poop...