This idea Pakistan's Nuke can end up being with terrorist is used very loosely. I do not think it can happen so easily. If chances of this happening was felt US will act before India.
You rely too much on US government, bro. Remember that Pakistan's nukes getting lose in the hands of Taliban are an immediate threat to us. None of Pakistani missiles can strike US mainland since their range is centered around targeting entire India and possibly Israel. So any danger that comes from a nuclear armed jihad group is first to us then to Israel and finally to the wide world. I am already having my doubts that though Pak Army has the main control of nukes till now--- it is only a matter of chance that 1 or 2 might be let loose. Remember that Pakistan is frustrated because it is not able to keep up with us and is instead going in opposite direction. In frustration and hatred, it can do anything and that is what is the problem.
US knows ALL THE TIME that Pakistan is the cause of terrorism and separatism in Kashmir--even then why do you think it never directly implicated Pakistanis and sanctions them? They're not on their side anymore and US knows that very well. US also knows that secret links between Afghan Taliban and ISI that the latter is not willing to lose for anything since post-USSR war, it found Jihad as an effective tool to fight the superior Indian forces and try "bleeding with thousand cuts". Taliban in short is the second strategic asset that Pakistan has and now after shifting loyalties to China, it will be all the more vehement in saying NOs to US government.
Hence if there is something to be done, it has to be done by us and us only---relying on any other world power is stupid and naive. We've already suffered a lot thanks to the stupid naive attitude Gandhi and Nehru instilled in the thinking of Indian people and the result is the following that we're seeing to date:
1) POK still Pak occupied
2) Kashmir still not recognized by West as Indian
3) Jihad against India still a hush hush around the world
4) China claiming half of our states as if its a pizzeria order.
5) Pakistan continuing its terrorism and ethnic cleansing of non-Muslims in valley through proxies
6) Shaksam Valley being illegally handed to China by General Ayub Khan as a token of servitude and honor for Chinese aggression against India in 1963.
Are we still to follow the ideology of those two people who fooled an entire nation with their Utopian thinking, impractical planning and baseless theories? Wake up fellow Indians.