Bob Costas: An understanding that it is now indisputable that an entire era in baseball was out of whack, distorted, to some extent inauthentic, and has be viewed almost separate from the rest of baseball history. And that, although baseball is, in fairness, making a belated but now concerted effort to deal with the problem . . . all you can do is try to diminish the use of performance-enhancing drugs, try to change the culture surrounding the sport so that people voluntarily decide they are not going to do it.