It is something like MSM bias. There is no conscious attempt to shape views or attitudes. Rather, the recruitment, retention, and advancement policies produce institutional group think. Although lip service is given to the need for internal dissent and whistleblowers, people who openly criticize the institution usually don't get very far up the ladder. It is rare to find catalysts for change among career personnel. Most are "minders" not achievers.
Understood. I'd add most MSM types believe they are in the center, while their "center" is farther left than they realize. That's why we hear the "get out of the beltway" comments from some of the pundits who realize the group think of DC is not representative of the rest of America.