I'm kind of disappointed in the opinions of the other cyclists quoted. The problem isn't the pursuance of stopping doping. The problem is that doping is a serious problem that needs to be stopped for this sport to survive.
As seen in other sports, all doping ever accomplished was that more people did it. They had to dope to be able to compete with those that were already doing it. So everyone is engaging in a potentially life threatening behavior just so they can compete at the elite levels, and everyone that doesn't simply doesn't match up.
There has to be a point where the need to be faster doesn't also end your life and career as fast as it came.