White privilege turned deadly in Charlottesville: How would police have reacted if a mob of angry black people had gathered there?

I offer the following thought experiment.

Last weekend, hundreds of white supremacists and other right-wing extremists descended upon the city of Charlottesville, Virginia. They planned their "Unite the Right" rally months ago on the internet and in other public forums. The organizers encouraged their followers to bring weapons to Charlottesville. Many did so.

On Friday night, hundreds of white supremacists marched through the city, torches in hand, channeling the brutality and evil of the American Ku Klux Klan and the Nazis of Hitler's Germany. These white supremacists encircled a black church and threatened to burn it down -- and by implication kill all the people inside. This same gang of thugs then surrounded a group of University of Virginia students and beat them.