This seems to me like a massive waste of time and resources and an extremely poor exercise of prosecutorial discretion. Making the situation appear even more hypocritical, as I pointed out before Clemens' ill-advised testimony to Congress, "We couldn't get Condi Rice to testify under oath about 9/11, and myriad Bush administration officials under the GOP Congress were allowed to appear before Congress without risk of perjury charges if they lied," but the feds are using Clemens' Congressional testimony as a perjury trap to go after
Perjury is a crime that's prosecuted very selectively, with many obvious instances routinely overlooked by prosecutors. Federal prosecutors are going after Clemens because of his star power, not because he poses some terrific threat to the public, or for that matter to anyone but a batter on the receiving end of a beanball.
UPDATE: Tom Kirkendall rightly delcares that "These witch hunts, investigations, criminal indictments, morality plays and public shaming episodes are not advancing a dispassionate and reasoned debate regarding the complex issues that are at the heart of the use of PED's [Performance Enhancing Drugs] in baseball and other sports. On a very basic level, it is not even clear that the controlled use of PED's to enhance athletic performance is as dangerous to health as many of the sports in which the users compete."