Jason Stanley, It’s important because the truth is the heart of liberal democracy. The two ideals of liberal democracy are liberty and equality. If your belief system is shot through with lies, you’re not free. Nobody thinks of the citizens of North Korea as free, because their actions are controlled by lies. Truth is required to act freely. Freedom requires knowledge, and in order to act freely in the world, you need to know what the world is and know what you’re doing. You only know what you’re doing if you have access to the truth. So freedom requires truth, and so to smash freedom you must smash truth.
Reminds me of Sartre’s analysis of antisemitism: “They know that their statements are empty and contestable, but it amuses them to make such statements: it is their adversary whose duty it is to choose his words seriously because he believes in words. They have a right to play. They even like to play with speech because by putting forth ridiculous reasons, they discredit the seriousness of their interlocutor; they are enchanted with their unfairness because for them it is not a question of persuading by good arguing but of intimidating or disorienting.”