Independence from Britain is one thing and Indian nationalism another. Just in case you aren't sure, we celebrate the former today, not the latter. About the latter, or rather, about nationalism in general, I defer to Rabindranath Tagore - yes, that very man who wrote Jana Gana Mana:
Have you not seen, since the commencement of the existence of the Nation, that the dread of it has been the one goblin-dread with which the whole world has been trembling? Wherever there is a dark corner, there is the suspicion of its secret malevolence; and people live in a perpetual distrust of its back where it has no eyes. Every sound of footstep, every rustle of movement in the neighbourhood, sends a thrill of terror all around. And this terror is the parent of all that is base in man's nature. It makes one almost openly unashamed of inhumanity. Clever lies become matters of self-congratulation.
Solemn pledges become a farce, - laughable for their very solemnity. The Nation, with all its paraphernalia of power and prosperity, its flags and pious hymns, its blasphemous prayers in the churches, and the literary mock thunders of its patriotic bragging, cannot hide the fact that the Nation is the greatest evil for the Nation, that all its precautions are against it, and any new birth of its fellow in the world is always followed in its mind by the dread of a new peril. Its one wish is to trade on the feebleness of the rest of the world, like some insects that are bred in the paralyzed flesh of victims kept just enough alive to make them toothsome and nutritious. Therefore it is ready to send its poisonous fluid into the vitals of the other living peoples, who, not being nations, are harmless. For this the Nation has had and still has its richest pasture in Asia. Great China, rich with her ancient wisdom and social ethics, her discipline of industry and self-control, is like a whale awakening the lust of spoil in the heart of the Nation. She is already carrying in her quivering flesh harpoons sent by the unerring aim of the Nation, the creature of science and selfishness. Her pitiful attempt to shake off her traditions of humanity, her social ideals, and spend her last exhausted resources to drill herself into modern efficiency, is thwarted at every step by the Nation. It is tightening its financial ropes round her, trying to drag her up on the shore and cut her into pieces, and then go and offer public thanksgiving to God for supporting the one existing evil and shattering the possibility of a new one. And for all this the Nation has been claiming the gratitude of history, and all eternity for its exploitation; ordering its band of praise to be struck up from end to end of the world, declaring itself to be the salt of the earth, the flower of humanity, the blessing of God hurled with all his force upon the naked skulls of the world of no nations.