Rational persuasion is hard but possible. Facts matter. People will often try to ignore or deny factual information in tension with their preferred views or interpret it in ways consistent with such views. Nevertheless, as Hannah Arendt points out in her article on truth and politics, factual truth places important limits on such propaganda and self-deception. There are hundreds of millions of users on X. The idea that all or even most such people are beyond rational persuasion is absurd.