If all your relationships fail in the same manner, it is likely that the problem is you.
> One friend became “convinced” that every major news story was manufactured consent. Another started treating political disagreement as evidence of moral corruption. A third began using the word "liberal" as if it was a personality disorder rather than loose coalitions of sometimes contradictory beliefs.
Manufactured consent is a real thing, with mounting evidence that it's becoming increasingly prevalent. The ownership structures around major news outlets are worrisome and what many considered 'reliable' for years are now showing seriously problematic habits (like genocide erasure - lookin' at you, NYT.)
Liberalism has come under completely valid scrutiny as we've seen fiscal policies implemented by Clinton and Obama blow up in our faces. No, we don't think Reaganomics is anything but a grift, but many of us see the grift in NAFTA and the ACA and Gramm-Leach-Bliley and have begun to question the honesty of centrist liberal economic policies because we are seeing them fail catastrophically.
> The incentive gradient was clear: sanity was expensive, and extremism paid dividends.
Author is doing something subtle here - without making a defense or interrogation of the statement, they are saying "Not being liberal / centrist is extremism, and thus invalid". I call bullshit.
I have not profited or benefited from my "extreme" leftist views. If anything, I take a risk every time I talk about them out in the open. My comment history is going to be visible to all future employers. Should the government continue it's rightward slide I'll have a target painted on my back that I put there. I don't believe the things I believe because it's convenient, I believe them because in my estimation, we are operating on a set of failed systems and it's important that we fix them because they present a real and present danger.
We have Trump because Biden was utterly incapable of facing the actual problems people are having with the economic prosperity gap. If you don't address the actual hardship in people's lives, you leave the door open for a huckster to make those promises for you. Most will take the unreliable promise of a better tomorrow over being lied to about whether they even have a problem. You don't need a PhD in economics to know that whatever the GDP might be you're still broke and you can't afford to feed your kids.