Does Bhutan's Proclaimed Happiness Rest on an Act of National Cruelty?

Viduyapati Mishra writes in the NYTimes:

After tightening its citizenship laws in the mid-1980s, Bhutan conducted a special census in the south and then proceeded to cast out nearly 100,000 people — about one-sixth of its population, nearly all of them of Nepalese origin, including my family. It declared us illegal immigrants, even though many of us went back several generations in Bhutan. It hasn’t let any of us move back.

The enormity of this exodus, one of the world’s largest by proportion, given the country’s small population, has been overlooked by an international community that is either indifferent or beguiled by the government-sponsored images of Bhutan as a serene Buddhist Shangri-La, an image advanced by the policy of “gross national happiness,” coined by King Jigme Singye Wangchuck in the 1970s.