Being born and raised at altitude gives you an advantage in the distances at any altitude. Having plenty of dirt roads gives you an advantage in being able to train at high intensity and quantity with less injury chances. Having few cars and buses means that kids very often have an extremely active lifestyle from an early age, many either walking or running miles to school and home every day, some also going home for lunch if they can't afford the school lunches. Having tremendous financial incentives helps a lot. Having a low calorie diet helps a lot. Having a culture of running hard helps a tremendous amount because that means that there are many, many very successful runners around now to work out with and to learn how to train from, in complete contrast to the United States or Europe, where in most places there are very few sub 15 people in any given area.
Add up all that and you don't need any genetic superiority, which apart from altitude adaptations, is unlikely given that we all evolved from the same group of people living in East Africa 200,000 years ago (with some differences from Neanderthal interbreeding).
Well, I am glad you convinced yourself of that. Now explain why West African sprinters are absolutely superior (in terms of top talent/success) than the rest of the world combined? I am sure you have some cultural explanation for this too? White guilt? Brainwashing to young whites that they can't sprint? Too lazy too sprint?