Why did the press believe Jimmy Massey's stories?

Media: Via Michelle Malkin comes this astonishing piece by Ron Harris who exposes the lies of Jimmy Massey and asks in a sidebar why did the press eagerly promote his stories? This is an easy question, because it fit into their conclusions that the US military people are scum and it helps to tarnish the war. As ABC's Terry Moran said on Hugh Hewitt's show.

TM: It comes from, I think, a huge gulf of misunderstanding, for which I lay plenty of blame on the media itself. There is, Hugh, I agree with you, a deep anti-military bias in the media. One that begins from the premise that the military must be lying, and that American projection of power around the world must be wrong. I think that that is a hangover from Vietnam, and I think it’s very dangerous. That’s different from the media doing it’s job of challenging the exercise of power without fear or favor.