Old South monument backers embrace Confederate Catechism

Not exactly, and some of the current arguments on both sides are incorrect.
Memorial Day in the South - Historians acknowledge the Ladies Memorial Association played a key role in these rituals of preservation of Confederate "memory." Various dates ranging from April 25 to mid-June were adopted in different Southern states. Across the South, associations were founded, many by women, to establish and care for permanent cemeteries for the Confederate dead, organize commemorative ceremonies, and sponsor appropriate monuments as a permanent way of remembering the Confederate dead. The most important of these was the United Daughters of the Confederacy, which grew from 17,000 members in 1900 to nearly 100,000 women by World War I. They were "strikingly successful at raising money to build Confederate monuments, lobbying legislatures and Congress for the reburial of Confederate dead, and working to shape the content of history textbooks."
David W. Blight (2001). Race and Reunion: The Civil War in American Memory. Harvard U.P.
Karen L. Cox (2003). Dixie's Daughters: The United Daughters of the Confederacy and the Preservation of Confederate Culture. University Press of Florida.

We still have Military facilities and public buildings named for traitors, fix that