My guess is that Haiti's so screwed up because it wasn't colonized long enough. The ancestors of today's Haitians, like elsewhere in the Caribbean, experienced the dislocation of de-tribalization, which disrupted the natural ties of family and clan and ethnicity. They also suffered the brutality of sugar-plantation slavery, which was so deadly that the majority of slaves at the time of independence were African-born, because their predecessors hadn't lived long enough to reproduce.
But, unlike Jamaicans and Bajans and Guadeloupeans, et al., after experiencing the worst of tropical colonial slavery, the Haitians didn't stick around long enough to benefit from it. (Haiti became independent in 1804.). And by benefit I mean develop a local culture significantly shaped by the more-advanced civilization of the colonizers.
You notice this line: "the majority of slaves at the time of independence were African-born"--yep, no civilization at all.
Item 2: "South Carolina Lt. Governor Andre Bauer(R)Compares His State's Poor Children to 'Stray Animals'" and advises against feeding them, lest they reproduce:
My grandmother was not a highly educated woman, but she told me as a small child to quit feeding stray animals. You know why? Because they breed. You're facilitating the problem if you give an animal or a person ample food supply. They will reproduce, especially ones that don't think too much further than that. And so what you've got to do is you've got to curtail that type of behavior. They don't know any better.
And y'all thought negative eugenics was a thing of the past!