How did we ever get to a world where Trump, QAnon, massive COVID death rates and Brexit happen?
It's as easy as quantum mechanics. Unless there's 100% consensus, there will be people who say that there's doubt. If there's 100% consensus, there will be people who say that is suspicious (i.e., "All the main stream media are saying the same thing; so, it must be a lie").
Maybe the link is not the skepticism about sources, but the attribution of bad intentions to any action. Much support for Trump came from the belief that there were evil intentions behind certain policies. Trump, for eg., was fighting against globalism and the radical left. Yeah, it's argued that he was fighting "for" something (Christianity, western civilization, America), but he always spoke in terms of "us" against the enemies of those things --which of course ended up being American Christians.
Q-Anon was/is motivated by those beliefs. I mean, c'mon. It wouldn't surprise anyone if there were Democrat pedophiles. It's just that it wouldn't surprise anyone if there were Republican conservative preachers of megachurches who were pedophiles either. Pick a sin, and I'll bet the ones yelling about it most have also done it as much as anyone else.
The covid crisis is another example. People have found reasons to be against it being presented as a problem because there's some evil intentions behind it. The same arguments are used concerning the development of a vaccine. When the vaccine comes, there are arguments against taking it --because "they" are using us a guinea pigs, or want to secretly implant microchips -that will communicate with the 5G towers.
Long story short: All you need to do is convince someone that there are evil forces behind something to get them to be against something.
[Edit] Example: “Let me say that again for Fox News sponsors,” he [Scarborough] continued. “For Fox News sponsors to let you know what’s happening now on Fox News. That they are getting people who are Fox News contributors, who are saying that Democrats, Joe Biden, and Democrats, want to, quote, exterminate all Republicans.”
"A man is rich when he has time and freewill. How he chooses to invest both will determine the return on his investment."