Agree! But, the nationalism display happens because of 2 reasons. 1) People making fun of how all Indian villages doesn't have electricity and it is spending money which is a waste. When someone makes this point on social media, people go on defensive on how great ISRO and India is. 2) The government and media aggressively pushes this as national achievement to ignite interests in sciences among kids and youth.

At the end of the day, ISRO will be an Indian space agency and so the nationalism display, sometimes though excessive.

We often forget that despite all the claims of NASA being a world space agency, the flag on the moon is an American one, not a UN one or a representation of some other world agency.

I completely agree that nationalism is horrible for something as important as space colonization. But make no mistake, unless we manage to form an international government before space colonization commences, there will be a scramble for space colonies, much like there was a scramble for colonies on earth.