The whole notion of "my country" is really interesting... If you were swiss, but born and raised in India, does India become "your country" or not?
The media in Subcontinent area feeds loads of BS about nationalism to the point that you start to believe it and start to thing it's true. Even the Indian national anthem's first verse is India is better than the whole world. Perhaps upon leaving India people realize common threads of humanity that bind communities together.
With the advent of the internet hopefully more people are learning this without having to leave a country as people work in multi national teams remotely. The people I interact with are very every day are in India, UK, Bosnia etc. We work on the same thing together. There are accents and cultural differences, but a lot of what we assume about people we haven't met dissolve in the face of realities which challenge your biased views.
The internet in some way has helped dilute the power of national boundaries. You find clusters like HN where people of all background come together and interacts based on commonalities that transcend mere physical attributes of our existence. While I agree that the physical attributes are still important, nationalism is not a physical attribute, it one imposed by some a-hole who wanted to draw lines and have power.
Love your mother, your family and the hospital that you were born in. (If you were born in a barn, said love should go to barn). Destroy those to dare assert superiority over those who were born in your particular hospital/field/barn etc. If that sounds ridiculous, please thing about how some other arbitrary inanimate object in place of hospital/field/barn makes more sense.
No, your family usually cares about and for you, unlike the hospital you were born in, which you cannot rely on for any favor.
About the country issue, it is simply a manner for many people to identify others on many traits using common associations (e.g Indians are poor, Eastern Asians are hard-workers, Swiss are meticulous), that sometimes relate to accurate correlations. And it's one of the few ways, other than age and salary, to do this kind of association in a neutral and non-controversial way.
If you were born in England, and raised in India, you do have have dual allegiances, but probably more to India.