most professional athletes are dopers
Nonsense. Sport is an agreement to be the fastest, strongest, most skillful while abiding by a set of agreed rules.
If you deliberately break those rules you are not doing sport anymore.
If people want to find out how fast or strong an athlete can be with drugs then that's a different game.
Cycling was rotten to the core for many years, the new generation is awesome and the best in the world are British.