… although Tom DiLorenzo…
… although Tom DiLorenzo and I would say the Southerners were right to defend themselves …
Throughout the Civil War, the Confederates were actually fighting a two-front war: about 1/3 of all Confederate military forces were continually held behind the lines in order to capture fugitive slaves and suppress slave revolts (which had been escalating for decades, and erupted across the South during the war).
I agree that Southerners had a right to defend themselves against aggression. Including the Black ones. Describing the Confederate war effort (1/3 of which was directed against Black Southerners seceding from their slave pens) as self-defense seems dubious at best.