That still doesn't say it's the fate of all those people, and a debt could be so large that it enslaves your family and children too. There should be some further lore clarifications. Which is to say, if Senator Torval keeps seeing slave revolts, perhaps she's actually not honorably treating her slaves? That would be an act of great dishonor. You could spin your thoughts on this any way you like. If slaves are contented, why would they revolt? What are their living conditions actually like? Senators are, after all, above the law.