But, where you do have slavery you tend to have a culture that justifies it. Bizarrely in the American South, even 150 years later. That culture is fairly open to criticism, even though human nature indeed is pretty much universal.
A culture is not a compass point. In this case the culture was Democrat.
The North has nothing to be proud of, and the South nothing to be ashamed. This shame lies on the political left.
I know you are not simple minded. What propels such an absurd notion? Tell me which makes one morally superior, living at elevation or at sea level? Living east or west?