Maybe you don't realize it, but that's a damning indictment of the culture surrounding the (illegal) saloon. "Say 'no' to us and we'll riot." That's a sick culture.
William Ayers and his band of marry marxists were 30 miles away in Ann Arbor.
That's the other key ingredient, and the one ignored by most commentators on the topic. The '60s race riots were ALL engineered, fomented, and driven by professional out of town agitators. They were most certainly not 'spontaneous'.