Did you peel that back to the next layer? Did they want to reintroduce slavery? Or did they want independence from a distant government?
I knew folks in the South who thought some of the craziest racist things and probably would've been OK with slavery (I did hear them promote segregation).
At the same time, the vast majority folks I knew who defended the Civil War or wanted secession didn't want slavery or segregation, but local (and often less) government. Did they misunderstand the role of slavery in the Southern secession? Usually. Does that change their _current intent_? No.
The latter group (which was much larger) should be engaged with on the issue of local government and secession, especially in the context of folks in Blue States who've been rattling about secession under Trump.