All a stupid person needs is a lot of stupider people.
People who project their own fears, weaknesses and failures onto others are easy marks for exploitation, selling their own fortune, honor, opportunity and welfare for a change to "own" some minority. It varies from exploiter to exploiter. Lately, "Foreigners, Minorities, Women, Socialists, Gays and Liberals" in the graphic. [0] Stock fascist playbook.
Every appeal is to "the old brain".