I was in India recently for 3 weeks, first time as a vegan. One argument given to me was that cows would not give milk before they fed the calves. This does change my stand, even if it is true, and I don't think that is true.
Indian vegetarianism is based mostly on tradition and dogma, lacking fundamental thought.
This is one reason why many Indians start eating everything when they move abroad. One would want to think otherwise considering the fact that India is the origin of vegetarianism, and that people like Mahatma Gandhi were from India. Mahatma Gandhi is the antithesis of Indian thought today. Indians did not seem to mind the use of leather at all, and non-food use of animal products was quite acceptable. There was also paramount ignorance and ignoring.