Can Giambi be an Externality?

For the past couple of years now we have had an ear full of steroid talk when relating to baseball. The latest story to hit the baseball headlines was not free agent pick-ups or any other kind of cool baseball topic it was Jason Giambi. If you have not heard Jason plays for the New York Yankees and has recently come out to admit publicly that he had used steroids. This brings me to my question, do you think what Jason Giambi or any other player using steroids for that matter is involved with the term externality? In class we covered that an externality is when decision makers do not consider all relevant costs and (or) benefits. With Giambi being on one the biggest center stages in baseball do you think that him using steroids has caused some sort of negative externalities? With all the fans who would have given anything to see their hero hit that long ball do you think that Giambi really gave a crap about their feelings and how they loved him oh so much? This is just one externality that might be present, can you think of any? May you think that sports figures should be free to do what they will, explain why.