It has nothing tod owith race , but rather when those "shitholes" decided to become modern states. Denmark had independent complex organizations since the 8th century AD, Haiti only in the 19th century. Your thesis about nordics making it in Haiti needs to be proven though, without any support from Europe I doubt that anyone would make it there, irrespective of their race. But nordics would have a disadvantage in that climate considering their pale complexion and their lack of natural immunity regarding tropical illnesses.
Getting sent to the new world was seen as a punishment for the regular people (at that time), one worse than death. Brittain, France, Spain and the Netherlands all sent their criminals for colonization purposes. Now imagine just plopping 1000, 10000 nordic people with very few resources in Haiti. If even the swarthy Spaniards and Portughese had issues surviving in that climate imagine how Börn and Hanz would fare.