Steroids in baseball - what's the problem?

The US Congress is investigating Major League Baseball's use of steroids. My argument - what's the big deal? If baseball players want a competetive advantage and want to smash balls over the fence or throw faster and they don't mind the future health consequences then why should anyone care? Baseball players are better today than they have ever been because they ARE using steroids. And what is the government involved in the business of a private enterprise?