Point being, national sovereignty doesn’t outweigh wanton cruelty. It’s the same argument with the Confederacy, “States’ rights? States’ rights to what?” No state that employs that kind of system has the right to exist. The Union defeating the Confederacy and freeing the slaves, even if it wasn’t total liberation, was completely justified and made a marked improvement in countless people’s lives. Yes, there is still more to be done, but the world is a better place because slavery, as an institution, was ended by force.