The foundation of journalism is accurate sources. Anyone who considers themselves to be in the business of informing the public about the truth should care very deeply when faked documents make it into the public record. They should especially care if their own work has been the vehicle.
Dismissing the possibility of fakery--and the obvious questions about who might have perpetrated it--does not help us focus on the "real issues". Instead, the stubborn willingness to ignore obvious problems becomes the story--something that Dan Rather learned to his dismay in 2004.
Unless you're Megan McArdle.