Anyone who thinks genes don't matter, need only look to Haiti and the Dominican Republic. Haiti shares the island of Hispaniola with the Dominican Republic.
The Dominican Republic has a vibrant economy attributable to beautiful resorts, and an industrious populace, all anchored with a solid manufacturing base, particularly in clothing and textiles. GDP growth rate is the highest in the Western Hemisphere, and has been averaging about 7% per year, truly phenomenal.
Comparing the Dominican Republic to Haiti is comparing Rodeo Drive to the slums of Detroit. Interestingly there is no "refugee" problem with the Dominican Republic. And the Dominican Republic is hard core in securing its border with Haiti. Needless to say, any Haitian sauntering over across that border is dealt with severely.
Same island, same climate. Different outcomes. — a perfect controlled experiment. One country is the gem of the Caribbean, the other is a third world shi+hole.
Under Papa Doc Haiti was clean, sanitary and had a strong economic base of light manufacturing. Clinton established an embargo that completely destroyed the economic foundation of Haiti literally overnight. 90% of the economy was based on manufacturing goods for US companies. The embargo stopped this trade dead in its tracks. The Haitian economy was devastated and has not been able to be restored thanks in large measure to the continued criminal influence of the Clinton crime cabal. The Clintons are the most hated people in Haiti.