I really do not see what your point is. Of course there are things that are and should be illegal to say — but none of them are really politically relevant. Protecting free speech is about protecting dissent and the expression of political and related (e.g. artistic) ideas. Perhaps you can contrive of situations where your examples overlap with dissent. I guess the main one will be inciting violence, and in this case the "paradox" isn't entirely ridiculous. The problem is that it can be used as a very convenient justification for the suppression of entire heterogeneous groups. Which is why the violence itself is what should be illegal, and not the speech.