The sport of Body Building, and remind me how it is still around?

As a trainer, I have to wonder how sports like Body Building are still around. A sport that is so infected with cheating it's known by everyone, literally, EVERYONE. We all know most body builders take steroids. It's no secret, no body looks like that without the use of them. There have been several documentaries on body builders who try to win the natural way, the real way, the way that takes real work and dedication, such as any real sport would. We all know the ending, they get beat out by the guy who is a 'roid head. My question is simply this: How in hell is body building still around? Officials know, participants know, people who go to competitions, the competitors themselves all know, its a 'sport' plagued with drugs and shortcuts. I can tell you now, no other sport would allow for that. Am I turning a blind eye to the fact that steroids are used in every major sport? Absolutely not, but when it becomes known to the public, something gets done about it. Why has body building been made to be the exception? It really does baffle me. It goes against every fiber of the basic component of any sport. Athletes train hard, it becomes what they eat, drink, sleep. They beat the sun getting up to train. They do this day in and day out, many times they pull two-a-days just to get up to par with the competition. Blood, sweat, and tears are the foundations of a sport. The use of performance enhancement drugs are severely looked down upon. It's cheating. Sports don't accept cheaters. Why does body building accept cheaters? Do you not take it offensively when someone is found to be taking steroids? Does that not discount your efforts when the winner of a Mr. Olympia competition is a known steroid abuser? All really good question which I am not asking rhetorically. I would like answers because I am generally curious. One of the many anomalies that will probably never make sense to me.