I'm certainly no lawyer or 1A scholar, but the example of yelling "Fire!" in a crowded theater seems to have a parallel here. Still, no accountability?

That example is one of the most frequently repeated legal myths in America. It was dicta in a decision that has since been overturned. The actual legal standard for incitement is very difficult to meet, and Vance's statements, despicable as they are, don't meet it.