I guess you haven't dealt with any dyed-in-the-wool liberals.
Media is constantly plying us with false concept!
Take abortion. The truth is (allow me to use very rough numbers here) 15% of people believe abortion is acceptable as birth control, 15% believe abortion should be prohibited for any situation (such as rape, or mortal threat to mom). If the media is going to talk about abortion, they are not going to pull from the mainstream 70%, they are going to pull from the 15% groups.
Same for any other hot-button topics. The media will try to find the most extreme they can among these extremes (Is the right properly represented by David Duke? Is the left properly represented by AL Sharpton?)!
When 24/7 news came to be, you suddenly had "news" in competition with sit-coms, game shows, soaps, etc. Smart people have figured out presenting extreme (not representative) viewpoints and marketing "fear" are their two best means to keep you watching!
Before 24/7 news, the news was, how shall I put it,
news. It came on every evening and you watched the news, or turned the TV off. Now it is entertainment.