They tolerate it because it’s all folks working off their karma.
Dominican Republic is on the same island but they didn't have nearly the disaster.
Why?
The Dominicans are more Westernized and Christian, at least nominally.
The Haitians will steal then trade what they stole to a vodoo witch doctor for magic that will make them rich and they will throw in their 8 year old daughter for him to rape.
The Dominicans will get up every day and go to work and build, little by little.
Another thing is Haiti is so corrupt.
Pay off the inspector and you can build a multistory office building with concrete that wouldn't pass in a retaining wall in Iowa.