You don't get me, right? People eat rice, because this is the cheapest food available. Some people can afford only rice and nothing else. Those people thus have a quite unbalanced diet, and Vitamine A is one (but not the only) nutritient that is underrepresented.
To solve this problem by adding Vitamine A to the rice is misguided. The diet is still unbalanced, and just adding more and more nutritients to rice will just make the crop yield less in general, being thus more expensive, and people will still be poor and not able to afford anything but rice - and in general more of the old fashioned white rice as this one will still be cheaper.
It would make more sense to empower those people to earn more money to pay for a much more balanced food.