@ aplenty- Genetic engineering has its disadvantages and your example of golden rice is a prime example. First of all, it would be much cheaper to give every citizen suffering from iodine deficiency two iodine pills per year than it would be to genetically modify rice. Besides, there are questions to the ability of the body to actually assimilate the vitamin A in Golden Rice, and so far, it is likely a waste of money.
Second, what happens when golden rice contaminates other strains of rice and then an unforeseen impact has a negative effect on golden rice? Genetically engineered crops have a tendency to become dominant species, but their long-term interactions in local ecosystems are unknown.
Finally, creating another technologically engineered solution only creates a situation where developing nations are further dependent on industrialized nations to survive. This does the opposite of actually helping people pull themselves out of poverty. Disadvantaged groups become even more indebted instead. We should be careful in blindly unleashing genetically modified organisms into the environment.