Tamil Nadu has been a part of the Indian union since 1947. However just like the "dharmic civilization" or "Vedic civilization" that the Hindutvadi lot love to talk about, the Tamil civilization has been in existence long before anyone thought about the idea of India. Sure, the hindutva lot can have a masochist fetish for authoritarianism and fascism and love the idea of an absolute monarchy under the supreme leader, but as I understand, India is a federal union of states. Tamil Nadu provides far more to the Indian union than it receives, and is effectively subsidising the growth of other poorer states in the Indian union and therefore I definitely don't need lessons on resources being used to host refugees.
It's rich of you to talk "illegal refugees" using up resources but why should your fellow illegal Bengali hindu from Bangladesh get the rights to Indian citizenship and use up the Indian resources and not tamil refugees in Tamil Nadu who fled the violence during the civil war. Oh that's right, they don't form the votebank of your favourite fascist party.