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Whereas there were Christian abolitionists, they were the Quaker/liberal variant of Christian. The fundamental Christians were the ones who plumbed the Bible for every precious passage about slavery. Of course, they used those passages to justify slavery. The need for dominance is fundamental in fundamental Christians. It's just that today it doesn't get to play out in slavery. So, they've found other whipping boys in gays and abortion and they attempt to dominate the lives of gay citizens and women's wombs. If gay citizens were to gain equal rights, the fundies would just target some other group's rights.
So many of them apply lipstick, covet wealth, vote for war and torture, color their hair to contest God's will for us to age, practice gluttony, flash flesh, gamble, commit adultery, and fornicate. This is why they need to attend to the motes in other people's affairs: because they don't want to consider the logjams in their eyes.
Again, if they could have slaves and that would be socially okay, they would.
They would.