I did not think the link was political.
In my opinion current news outlets pitch hatred and division; they want viewers/readers angry and polarized. They offer affirmation (as opposed to information) to their particular viewership/readership and think that if they offer actual neutral news many of their users would tune out. Many outlets have token opposite points of view so they can pretend to be balanced but anyone with half a brain can tell within 60 seconds which way a news outlet leans.
I also think that the demographics of the reporters has changed over the years. In the past reporters were working class stiffs, folks who understood what being blue collar meant. They were willing to work long hours and overtime to dig out the facts and present good contextual background. Today the demographic is more formally educated folks whose only overtime is going to uptown cocktail parties and talking about going to the Hamptons.
Lastly, an unintended negative impact of the internet and 24/7 television is the need to fill space. Everything is 'breaking news' and a news cycle is now measured in minutes as opposed to days. This causes reporters to not do their jobs and verify information but also drives news outlets to rush to publish; a deadly combination if there ever was one.
This would explain the news media precipitous drop in 'trust' over the years. In 1972 only 1/3 of people polled said they had either 'Not very much' or 'None at all' trust in the news media. Today 2/3s of people polled reply that they have 'Not very much' or 'None at all' trust in the news media.