Because 90% of Americans have spent 12 years locked in government-run indoctrination centers, where Democrat Presidents are all gods, and all Republican Presidents are toadies of evil corporations.
It will not change until conservatives enmasse cancel cable and Sat TV which sadly is not gonna happen. TV news and TV with some of the print media control the country.
Fox is 5 to 10% owned by the Saudis but it is a big stake to heavily influence the management.