Because it's stupid. Most of the HOF's that everyone likes to tout as honorable players took amphetamines to keep their energy up during the season (they're now banned by mlb). You notice that the other leagues don't have these big pronouncements? Von Miller just got popped by the NFL, do you see wall-to-wall coverage by the tv networks on this issue?
Oh I agree on the amphetamines... Baseball wants their sport to be clean so be clean. Hell gambling was met with a lifetime ban..why not cheating/PED's?