Gregory thinks reporters are simply too lazy to go against the narrative. (See David Gregory hits media 'laziness'.)
"Lazy." That's a charitable way of looking at it. Another possibility is that they are caught up in the fervor for the progressive agenda and don't want to do anything that might detour from the mission.
Gregory is free to admit it now that he's been relieved of his role in Meet the Press, although if he remains at NBC he'll still be beholden to the narrative. But who knows? Maybe he'll become another Bernie Goldberg, slamming the lefty media every chance he gets.
In any case, Gallop.com reports that their poll results show media's credibility is scraping the bottom. See Trust in Mass Media Returns to All-Time Low. Democrats are the outlier with over half thinking the media are doing it just right.
Back to Gregory. The NBC audience consists mostly of Democrats who expect the leftish bias. Any reporter who disappoints them ends up on the outs. Ask Sharyl Attkinsson.