Because powers that be want control more than they want happy, well-fed, even productive population.

Ask any organizers of international food programs. In most cases local authorities will demand that they, not the international do-gooders, distributed the food. When they get hold of that food, they keep it under lock and key and distribute in a way that supports the existing power / social status structure, not in a way that helps most hungry people. Some food could even rot unused, but not given away to the hungry.

The problem is not a lack of food. The problem is that certain power structures emerged on top of traditional food-deficient economy, perpetuate it to stay in power, and can't be fixed by injection of food from the outside.