Wouldn’t it be John Stuart Mill who is wrong? I associate him with this idea (“facts can combat lies”) more than anyone. And I think nowadays a lot of free speech advocates are beholden to Mill, whether they know it or not. Many of the best known quotes regarding the importance of free speech go back to Mill.

So, I don’t think “Twitter” is the right pronoun for this headline. But I agree with the rest of the headline. Mill seems over optimistic when considering the realities of modern propaganda.