And so we pay more attention and give more credence to information and assertions that confirm what we already believe:
If “truth” is judged on the basis of Enlightenment ideas of reason and more or less objective “evidence,” many of the substantive positions common on the right seem to border on delusional. The left is certainly not immune to credulity (most commonly about the safety of vaccines, GMO foods, and fracking), but the right seems to specialize in it. “Misinformation is currently predominantly a pathology of the right,” concluded a team of scholars from the Harvard Kennedy School and Northeastern University at a February 2017 conference. A BuzzFeed analysis found that three main hyperconservative Facebook pages were roughly twice as likely as three leading ultraliberal Facebook pages to publish fake or misleading information.
At the most basic level, conservatives and liberals seem to hold different beliefs about what constitutes “truth.” Finding facts and pursuing evidence and trusting science is part of liberal ideology itself. For many conservatives, faith and intuition and trust in revealed truth appear as equally valid sources of truth.
Although Freud is out of favor with many contemporary psychologists, modern cognitive psychology suggests that he was on the right track. The tenacity of many of the right’s beliefs in the face of evidence, rational arguments, and common sense suggest that these beliefs are not merely alternate interpretations of facts but are instead illusions rooted in unconscious wishes.
Our reasoning is also influenced (motivated, psychologists would say) by our emotions and instincts. This manifests in all kinds of ways: We need to maintain a positive self-image, to stave off anxiety and guilt, and to preserve social relationships. We also seek to maintain consistency in our beliefs, meaning that when people simultaneously hold two or more contradictory beliefs, ideas, or values, one or the other must go. And so we pay more attention and give more credence to information and assertions that confirm what we already believe: Liberals enthusiastically recount even the most tenuous circumstantial evidence of Trump campaign collusion with the Russians, and dyed-in-the-wool Trump supporters happily believe that the crowd really was bigger at his candidate’s inauguration.
Source: : http://www.slate.com/articles/health_and_science/science/2017/11/why_conservatives_are_more_susceptible_to_believing_in_lies.html