President Trump has presented a world view that appeals to many people , i.e. that america can be great again if we  ignore lying media and unite behind a strong, common-sense leader who can out fox the corrupt establishment.  

Many people who voted for Trump do not adhere to his world view but those that do are required to ignore  facts and embrace falsehoods (recently being marketed as alternative facts).  This innocluation against facts is a calculated strategy adopted by authoritarians so that true believers will support their leader despite evidence to the contrary until the bitter end.