My concern is not the occasional shelling or exchange of machine gun fire between Indian and Pakistani forces.
My concern is the increasing radicalisation of Moslem fundamentalists, and quite a bit of that goes back to General Muhammad Zia-ul-Haq, who set Pakistan on a path towards militant Islamisation.
‘Sharization’ of Pakistan
The Islamic conservatism and the Islamic state became Zia’s primary policy of his military government. The secular-socialist orientation and socialist economics process was an attempt to upset to Pakistan’s order of operation on a routine life, as Zia maintained. General Zia rejected Bhutto’s philosophy and was reported to highly hostile of Bhutto’s philosophical rationale, “Food, clothing, and shelter”. General Zia defended his policies in an interview in 1979 given to British journalist Ian Stephens, as he puts it.
The basis of Pakistan was Islam. The basis of Pakistan were Muslims in the subcontinent are a separate culture. It was the Two-Nation Theory that carved out of the Subcontinent as Pakistan.... Mr. [Zulfikar] Bhutto's way of flourishing way of This Society was by eroding its moral fiber. Mr. Bhutto.. eroded the moral fiber of the society by pitching students against teachers, children against their parents, landlord against tenants, workers against mill owners. Pakistan is not incapable of economic production. It is because Pakistanis have been made to believe that one can earn without working.... We are going back to Islam not by choice but by the force of circumstances. It is not I or my [military] government that is imposing Islam. It was the 99 percent of people wanted; the street violence against Bhutto reflected the people's desire of wanting— just as the campaign for Pakistan Movement. I am just giving the people [of Pakistan] what they want.
—General Zia-ul-Haq interview giving in 1979 to Ian Stephens, 
On 2 December 1978, on the occasion of the first day of the Hijra to enforce the Islamic system in Pakistan in a nationwide address, Zia accused politicians of exploiting the name of Islam: “Many a ruler did what they pleased in the name of Islam.” After assuming power, the government began a program of public commitment to enforce Nizam-e-Mustafa (Islamic System), a significant turn from Pakistan’s predominantly secular law, inherited from the British. As a preliminary measure to establish an Islamic society in Pakistan, Zia announced the establishment of Sharia Benches. To many secular and communist forces, Zia cynically manipulated Islam for the survival of his own regime. In 1983, Nusrat Bhutto reasoned General Zia’s policies as she puts it:
The (scream) and the horrors of 1971 war..... are (still) alive and vivid in the hearts and the minds of people of [Pakistan]...Therefore, General Zia insanely.... used the "Islam [Card]".... to ensure the survival of his own regime....
—Nusrat Bhutto, former First Lady of Pakistan, 
If Pakistan is taken over by radical Moslems, I could easily see a nuclear exchange between India and Pakistan. In fact, with the new hardline nationalism of India, I’d be surprised if they didn’t launch first, rather than wait to see what the new Moslem fundamentalists of Pakistan decide to do with the nuclear toys which have fallen into their hands.