This, of course, is true, American markets would undoubtedly be very attractive, but exporting takes food out of an already under supplied area,
OK, so exporting makes it harder for local non-farmers to feed themselves.
But the non-farmer population can be a very small minority. The farmers can export what they like at high prices, and eat the leftovers themselves.
Why are there so many non-farmers? Why did they leave their farms? It was an idyllic lifestyle with not a care in the world.
falling into the trap of over simplifying a horrific humanitarian problem.
Nothing wrong with that. But when you find the simplification is too much, you dig a bit deeper. There is actually a reason that a lot of Africa is in trouble. It's easy to blame outsiders, but it's never been very successful at any time in history.