There is no double standard here, but only simple international geopolitics. Religion has nothing to do with it, but the responsibilities that come along with possession of nuclear weapons and what they mean for the entire world. For example, what happened to ensure that there was only one successor state with nuclear weapons after the breakup of the USSR is the same principles in action.
It is mere common sense for other major powers to have contingency plans for Pakistan that would be applicable only if the security of any nuclear weapons is ever in doubt. They are secure for now, undoubtedly. They are part of a stabilizing mechanism that has prevented any major war in a volatile region of the world for over half a century. But what about decades in the future given the consistent failure of the Pakistani State in dealing with its ever-rising internal existential threats? Who knows? But at least the scenarios and plans are thought out beforehand by not only USA, but China and Russia as well, in the hopes they will never be needed or used.
(And such plans are also considered for India, just so that everyone can see such plans are not against any one country, but simple common sense, given the nature of the weapons involved.)
