Nuclear weapons are generally secured extremely well. Even in the VERY unlikely event you came across one, you almost certainly wouldn't be able to set it off.

Pakistan is one of the few places where a government might lose control of their nukes. In a situation where there is mass starvation. I can easily see an insurgent government trying to use those nukes to blackmail the world.

Or perhaps using them on India in an attempt to take back Kashmir. Which would be BAD for Pakistan and India but probably wouldn't directly affect the rest of the world.

Perhaps I am simply blasé about nukes having grown up during the Cold War. I actually did "duck and cover" drills as a child in grade school in the early 60's. I lived my whole adult life under the shadow of nuclear war and it NEVER happened.