We punch mirrors and we explore our darker selves. No, it's just an amalgam of all newscasters that we grew up with. Sort of like before there was cable, when these people were like gods.
The crush of lobbyists on Washington and purchase of the media by corporations has created a big business-run government and a worthless press leaving Americans screwed and ill-informed.
Hollywood is for-profit, is what Hollywood is. All the studios are owned by big, megacorporations that are the furthest thing from liberal you can possibly imagine.
It so happens that America, according to all the polls that are out there, is pretty progressive. So you're not going to see messages that support Ayn Randian individualism at the cost of the whole, because most people don't agree with that.