Unless it's directly inciting violence, yes.
> How is that workable? Many people cannot distinguish fake news from legitimate sources of information.
The track record of restricting information from people because you feel like you're smarter than they are is not great. It's also impractically subjective.
> Increasing noise (disinformation) is just as damaging to free speech as decreasing the signal (censorship).
I consider your suggestion of encouraging clamping down on free speech too dangerous to discuss. By your logic should I be able to prevent you from expressing it?