Why most Tibetans are settled in South India and not the North??

It is really surprising to see most Tibetans settled in South India, although their homeland is more close to the North. There was not enough space or accomodation for Tibetans in the north, it seems! Blame it on the people of Himachal Pradesh.

In the article "Seekers of Refuge in a Land of No Return: Conversations with Tibetan Refugees in Bylakuppe" that is presented in

http://www.vagabondjourney.com/90-in-002-tibetan-refugees-in-india.shtml

Seekers of Refuge in a Land of No Return: Conversations with Tibetan Refugees in Bylakuppe

The Bylakuppe Tibetan refugee camp was created in the south western portion of Karnataka state, which is located in the far south of peninsular India- over two thousand kilometers from Tibet. This was the first and largest of the intentional Tibetan settlements in India, and was created in response to the need to consolidate the masses of Tibetans who were fleeing the Chinese occupation of their homeland. Initially, the Tibetans formed haphazard habitations around the Indian border states of Arunachal Pradesh, Sikkim, Assam, and Himachal Pradesh; where they found only modest amounts of governmental support, and lived in loosely assembled camps. Many Tibetan refugees died as a result of living in these highly crowded and unsanitary conditions. This unsteady state of affairs provoked the Indian government to construct a very large settlement in the far south of the country for the exiles to reside in.