Earlier quoted context omitted.
> Most countries around the world abolished slavery peacefully. [citation needed]
https://en.wikipedia.org/wiki/Abolition_of_slavery_timeline From a quick skim, the US and Haiti seem to be the only non-peaceful abolitions out of hundreds.
More importantly, I'm not sure what this has to do with Rayiner's point. The realization that many plantation slaves would be better utilized as doctors and lawyers did not free the slaves, nor did economic competition from non-slaveholding plantations. It did, in fact, require coercion.