With Trump and the Republicans in charge in the US, they are being governed by people who are completely alienated from the idea that objective assessment of evidence is the way to make policy choices. “Mainstream media lies!” is intellectual laziness and disputing facts is not expressing an opinion. 
A truly loyal Trump supporter would acknowledge the trouble that he faces and resist the simplistic defense that everything is going just fine. The Russian investigation and not passing any major legislation is not doing fine.
Infowars, Breitbart, The Rebel, Fox News. Sources like that do not present facts, they sell self serving Conservative interpretations of reality. And this willful ignoring of facts and truth keeps the US on the road to chaos and dysfunction.
Trump's persistent disregard for truth is a form of delusion and madness. It's called denial.