Profits & Parasites.
If some parasite is unable to make a profit off of people eating, then people starve, even where there is abundant food. If some parasite is unable to make a profit off of housing people, then people will be homeless, even when there is abundant housing. If some parasite is unable to make a profit off of treating disease, then people will die, even when there is a cure available. If some parasite is unable to make a profit off of labor, then...