I think that’s wrong. Slavery existed because the government allowed it. If you were a farmer and you could afford slaves but didn’t have any, you wouldn’t be competitive with other farmers who had slaves. You were encentivized to do it. But then ol Abe did an amendment and a war, and then once it’s illegal you aren’t pressured to be terrible. You’re off the hook. It was the amendment and the war that ended slavery, not people voluntarily doing anything.
It’s literally why we have laws. If people would just do the right thing otherwise, we wouldn’t need them.