Look at it another way. Because of a big fall in the purchasing power of the poor. We have a surplus of hunger, not of food. A hungry surplus. What makes this more bizarre is that if you go back to large parts of rural India during a good rainfall year, you can still see much of the same distress.
Millions migrate each year, scraping around for employment, even when there is no drought.
Sure, you have a situation of very great distress in several States. And yes, drought is a significant factor in deepening that distress. It helps make an unbearable situation impossible. It adds many more to those millions of migrants. It sharpens water, fodder and other shortages.