I find it interesting first of all that local news -- and weather, especially -- are the most trusted in the US. It reminds me of that old half-joke that everyone hates Congress but loves their congressperson -- but more likely it's that the issues that hit close to home are less likely to be polarized across traditional political lines.
We've long passed the inflection point where people seem to judge trustworthiness based on alignment to their own predetermined biases. If I tell you that what you think is wrong -- even if I have a factual basis for that; or more mildly, just frame something in a way that you might disagree with, you can label me as biased.
How did we get here? I think a lot of the blame comes from social media. Local news really cannot trend -- by definition it appeals to a narrow audience, and no one is sharing city council minutes. People do share outrage -- forcing the most polarizing content to the top. And, not for nothing, newsfeeds often put propaganda and disinformation -- or just lowest-common-denominator ("7 child stars: where are they now?") -- to compete at the same level as traditional journalism.
I (previously) wrote some thoughts here: https://blog.nillium.com/news-was-never-meant-for-social-pla...