"Supidism" is the exploitation of people that have poor comprehension, short attention spans, inability to see long term effects of a thing, engage in poor risk management, demonize education as the "enemy"... etc.. for the purpose of gaining their political support (vote).
About 20% of the population of the United States are just plain stupid, and highly susceptible to Stupidism.
You can't fix stupid.. but we can fix Stupidism by requiring a passing grade on a US Citizenship exam to be able to register to vote, for example.