Would you please post a citation for your excellent context description? Did you write it? If not, where did it come from?
The Long History of Southern Terror by Heather Cox Richardson, June 21, 2015.
She wrote about the Dylan Roof murders of black parishioners at Charlestons Emanuel African Methodist Episcopal Church and said it "replayed a central theme in American history." She included the text I posted as a backdrop to her condemnation of America in the 21st century.
Just coincidentally, Newt Gingrich wrote an excellent article a few days ago that was posted on FR where he discusses the Jacobins and their extreme terrorism in the French Revolution. See Newt Gingrich: Democrats have no idea what demons they are unleashing (FR) and the original Newt Gingrich: Democrats have no idea what demons they are unleashing (Fox News).