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Shouldn't we be convinced by good (valid) arguments and not by bad ones? But there are valid arguments with true premises that are not known to be true. What we minimally expect is that people follow the logic of the argument. How will they do this? Descartes advised us to perceive clearly and distinctly the steps in the argument. Aristotle looked toward the enthymeme so that the audience would draw the conclusion on their own. These 'thinking through' strategies are an aid to conviction but cannot guarantee it. Do we need the fallacies and other dirty tricks of rhetoric after all?