Maybe we've been brainwashed by 130 years of Yankee history but Southern identity now has more to do with food accents manners music than the Confederate past. It's something that's open to both races a variety of ethnic groups and people who move here.
A band is not a marriage. There are no oaths of allegiance. If you feel your life will be better served by splitting up the group you've got to do it - but of course it does cause problems.