I will leave arguing with you with this post:-
Fire away your nukes, all you will have a millions of square kilometer of land not suitable to live, grow crops or anything for years, sanctions against your country and increase in Chaos in your country itself.
Start reasoning than thinking logically. Even China had enough firepower to grab India's major part during 1962 and even after that but they acted smart. War in countries like us, the developing one causes downturn and slowdown of economy while for developed countries like US, its a good business.
China is your all-weather friend, start taking advice from them especially when economics is concerned. If you would have took their advice, you might be in better condition in which you are now.
Read Sun Tzu's Art of War or watch documentary on it. India is fighting with you through economy.
Economy is the new Nuclear Weapon.