Sure, it's cheating, and grown-ups should be embarrassed about cheating, especially grown-ups who already play games for a living. Not to mention very unhealthy.
But it's just a game -- baseball, bike racing, bocce. They're fun, they're cool, they're whatever. But in the end, they're entertainment. So A-Rod or Lance or whoever using steroids matters about as much to us as Stallone or Arnold. Or actresses shooting botulism into their faces. Which, not for nothing, is gross. But you don't hold congressional hearings about it.