I hold no brief for “the Lost Cause.” IMHO, they were traitors fighting for an exploitative, racist system. The rank and file who were in the majority that didn’t own slaves were still deeply vested in the notion that they were at least inherently superior to blacks. The South benefited greatly in the Electoral College by counting black people as a fraction of a person, even though that fractional person had no rights. The fact that slavery continued after the revolution was shameful, IMHO, as was the Dredd Scott decision. The events in Bloody Kansas and the Missouri Compromise showed just how devoted to the cause of slavery they were. The existence of Jim Crow shows how deeply embedded in Southern society racism was…and in some quarters, still is.
At the same time, one must have historical imagination. One must look at someone like Thomas Jefferson and realize that Sally Hemmings was his late wife’s half sister. That a constitution that did away with slavery would never have been ratified. And so on. One must understand that for many–and quite possibly many in the North, also-- the loyalty to one’s state was greater than to the Union at that time when the nation was new. One must understand that there were deeply conflicted individuals such as Robert E. Lee, who wished to free his own slaves, but was prevented by the laws of Virginia from simply doing so, since those people would have to immediately leave the state, leaving all friends and family behind. He felt responsibility for their futures. He thought he ought to find places for them to live and work, rather than simply cutting them loose. (Or so I have read.) Perhaps he should have just done so anyway. But it is easy for us to say.
It was not a minor matter for him to forswear his oath as an officer in the US Army. I think that the magnificent book by Michael Shaara, The Killer Angels, captures the subtleties of the time very well, as does the movie Gettysburg, which is closely based on the book. (The later books by Jeff Shaara, his son and research assistant, are nowhere near that quality, and the sequel to the movie, backed by Ted Turner, is a disgusting piece of Southern Lost Cause apologism that I was tempted to walk out of.)
One must acknowledge that some free black people were slave owners, as bizarre as that seems. One must acknowledge that there were some white slave owners who fathered children with black women who were in essence their wives, and not only recognized them but saw that they were educated and left property to them. And yet there were other men who treated their own children like chattel.
Nothing is really that simple, and it is not wise to severely judge historical figures by modern standards. Don’t forget that black men had the vote long before women of any race. Many champions of human rights didn’t extend that to their own wives.