To the Editor: Re "Chairman Exerts Pressure on PBS, Alleging Biases" (front page, May 2): The job of the press is to scrutinize government, not praise it. The administration gives its story in the best possible light using taxpayer money. That must be countered by a vigorously critical free press. When have administrations, either Democratic or Republican, presented evenhanded pictures of what they do? The question isn't whether "Now" (formerly "Now With Bill Moyers") is critical of the Bush administration but whether it behaved differently during the Clinton administration. If anything, our press has failed to be critical enough. Charles...