The paradox doesn't apply to actors operating in good faith who simply disagree, but those whose intolerance extends to authoritarianism and violence in oppressing the free speech of their opponents, such as the Nazi regime that insipired it, and its truth seems self-evident. You'll have to explain to me how greater tolerance of the Nazis would have resulted in a better outcome for anyone (besides the Nazis) than intolerance of them in order to disprove the premise.