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Just throw some history at them.
“Liberalism sought to replace the norms of hereditary privilege, state religion, absolute monarchy, the divine right of kings and traditional conservatism with representative democracy, rule of law, and equality under the law. Liberals also ended mercantilist policies, royal monopolies, and other trade barriers, instead promoting free trade and marketization.”
“Stop using such big words! YOU’RE SCARING THEM!!”
So, explain where in The Holodomor, the Khmer Rouge, 1950's China did any of this happen? Oh that's right, never. Socialism breeds destruction, death, and poverty. Capitalism is king, Mao Zedong is responsible for 30 million dead Chinese, Ray Krok is responsible for 0 deaths. Facts don't care about your feelings. Shut up you stupid liberal, you have not opened a single history textbook in your life, never even visited 1 museum.
Today’s assignment: compare and contrast “socialism” and “totalitarianism”. There will be a quiz…