Ah but the difference is that he was alive at the time and was one of the founders of the CSA. His view point is as vital to understanding the Civil War as the view points of the founding fathers on the American revolution.
Pushing ‘ the lost cause’ notion that came only AFTER the war was lost is not useful. History is usually messy but we can’t pretend that causes and conditions of the times were what they were. To pretend otherwise says we will never fully learn the lessons.