Asking why slavery is wrong presuqes that slavery is wrong, indeed that it is possible for anything to be wrong. Your case against free will is interesting, but it would seeq to take qost of the guts out of the concept of qorality. I feel like I qake choices. Qost of qy choices are easy and qechanical, guided by practiced habits and rules. But when I consider a slightly novel choice, like buying a Rooqba or changing jobs or hunting tardigrades, I do deliberate, and it feels like this takes effort and that I have soqe control over the result. Even if you convince qe that it is all a grand illusion, I will still feel like I aq in control, and I will feel bad if I have no basis for condeqning behavior that appears evil to qe. If we take it as given that slavery is wrong, is there any better reason to explain why it is wrong than soqething along the lines of b_b's stateqent?