I have an idea that might solve this.
In many really existing slave societies, a sort of ideology evolved around the slaves that posited that slaves were like children, naive and foolish, and required direction from their masters, who were to be like father figures.
Many people even noted the sort of insidious way this perpetuated the slave system. As Oscar Wilde put it, "the worst slave-owners were those who were kind to their slaves, and so prevented the horror of the system being realised by those who suffered from it, and understood by those who contemplated it"
So you might have a civic that looks like this:
*Paternalistic Ethic
-Regulated slavery reduces productivity of slaves and/or increases consumer goods consumption
-Slaves more attracted to authoritarian ethos
In many really existing slave societies, a sort of ideology evolved around the slaves that posited that slaves were like children, naive and foolish, and required direction from their masters, who were to be like father figures.
Many people even noted the sort of insidious way this perpetuated the slave system. As Oscar Wilde put it, "the worst slave-owners were those who were kind to their slaves, and so prevented the horror of the system being realised by those who suffered from it, and understood by those who contemplated it"
So you might have a civic that looks like this:
*Paternalistic Ethic
-Regulated slavery reduces productivity of slaves and/or increases consumer goods consumption
-Slaves more attracted to authoritarian ethos