In Why Plato Matters Now, the University of Sheffield philosophy professor considers what the ancient thinker might have to say about free speech, fake news, and populism today. What would Plato think about current anxieties over populist threats to democracy? Plato gives a coruscating analysis in The Republic of how democracy can be subverted by demagogues who lapse into tyranny. First, the demagogue gets voted into power by claiming to be the champion of the people.