The United States is not just the country with the largest arsenal of nuclear weapons. They also happens to be the only country on earth who have used nuclear weapons against civilians. None of the other countries, including the former USSR and North Korea have used nuclear weapons on civilians, despite having the capability to do so. And I still remember the sanctions and embargoes imposed by these hypocrites in 1998, when India tested nuclear weapons. And they invaded Iraq claiming that the latter was trying to develop nukes.
We live in world where might is right i.e. Big powers are free to do whatever they want. Nobody questioning Isreal nuclear program nor anyone has any objection on nuclear program of usa, UK and France.
Pakistan and India both are doing harm to themselves by buying expensive weapons from West and using against each other. India test first nuclear weapon in 1974 and just to check whether Pakistan has nuclear weapons they tested once again in 1998. If both Pakistan and India can resolve there issues and live in peace it will definitely better for 1.5 billion people.
But it will defiantly hurt the weapon market of West.