Ultimately, perhaps, it's all about money: the big ad-supported media, which are now mostly owned by billionaires, chase "gotcha" moments over long-term analysis that might question too much (like why life expectancy is declining for all but the super rich, in the wealthiest country in history, for the first time in nearly a hundred years). At the most basic level, though, it shows fatal flaws in what many journalism schools have taught as good practice, especially the idea that both "sides" need to be given equal coverage, even when there's only one that's right and/or the other constantly lies.
Assuming that all politicians are trying their best to speak the truth is an incredibly privileged assumption. These people have clearly never experienced the extreme media distortion in authoritarian countries. That’s where we’re headed, and they either learn how to counter the endless stream of bullshit from “conservative” “news” sources and spokespeople, or they’re just mouthpieces for it.