But they did practice slavery and didn’t want to support the Union cause. When Lincoln asked Kentucky Governor Beriah Magoffin for help in subduing the rebellion the reply was “President Lincoln, I will send not a man nor a dollar for the wicked purpose of subduing my sister Southern states.” So clearly a lot of Kentuckians, including those in the top levels of state government, self-identified as “Southerners.”
OK, so Magoffin and his ilk showed they were faithless, falsely sworn, and immoral. They may have claimed to identify as “Southerners” meaning in favor of secession and retaining slavery, but history shows their definition of “Southerners” should have been “people who have no loyalty to their country and wish to commit treason in order to retain a social system that lets them get away with acting like barbarians and inflicting inhuman cruelty on defenseless people”. And many people living in all the traitor states self-identified as “Pro-Union” and were cowed into submission. In the south in the years leading up to secession (treason), there were several plebiscites held to vote on the issue of whether or not to secede from the Union. The anti-secession faction won. Many people in the South wanted to remain in the Union even if they had to give up the institution of slavery. They were brutally suppressed by pro-slavery terrorists. Newspapers in the late 1850s both in the North and in the South carried many items about masked “night riders” raiding and burning the homes of anti-slavery Southerners, and resorting to worse tactics such as tarring and feathering, and outright murder in some cases. Sam Houston, the governor of Texas and once a slave owner, in the years leading up to the War to Punish Treason, tried to convince his people to abandon slavery. Shortly after the Texas state government voted to secede (commit treason), he was removed from office by the legislature when he refused to swear an oath of allegiance to the Confederacy, thus proving he was a much more moral person than Magoffin.
That’s kind of a stretch for arguing that a group of pro-slavery, pro-Confederate people who self-identified as “Southerners” shouldn’t be branded as “Southerners.”