But prior to the massacre had not many or most of the white population emigrated to destinations such as Puerto Rico?Ok then why didn't that happen after Haitians literally killed the vast majority (>90%) white population OTL? Surely that would be far more offensive than enslaving them.
https://en.wikipedia.org/wiki/French_immigration_to_Puerto_Rico#Haitian_Revolution
A massacre should be as offensive if not more than servitude. As people in servitude still has a chance to live, and their is still a possibility for justice to happen.