Today's right relies on fear to implement their agenda. Fear that a black president is going to steal America. Fear that a Hispanic is going to steal your job. Fear that a Muslim is going to kill you. Fear that an illegal alien is going to steal your vote. Fear that a third world tin pot country is going to nuke us (that doesn't even possess nuclear weapons).
They hope to use that fear to implement their brand of fascism. Any facts that may offset or invalidate that fear must be marginalized, dismissed, or attacked. The minions know that, and carry the flag of the wannabe oppressors accordingly.