Doping, 'roids, and all the other enhancements have been around longer than us and they're here to stay - in every sport, not just cycing. I think it's part of competitiveness of sport, in a way - i.e. every time drug testers find a new way to detect, athletes and their "trainers" find a new way to hide an enhancement.
If it torques you, then don't watch. But don't be naive to think that anyone is "clean" in any sport.
Kinda like thinking the pretty, innocent-looking girl in the bar is a virgin