The south went to war to protect and expand their Peculiar Institution. The north went to war to save the union and because the south had gone to war against them.
To be fair, the North wasn’t trying to crack down on Southern slavery. Not while it had the same institution itself.
It still was (to use a metaphor) bad karma. If someone can harden their heart badly enough to support that, they are going to overlook a mountain of other blessings too.
“The south went to war to protect and expand their Peculiar Institution.”
The money interests did exactly that and sold it to the common man as “the damn yankees are coming down here to rape your women and deprive you of your rights”.