Any country that drops nukes on Israel is going to become the US’s next target. I can’t see Pakistan wanting that.
For important context, Pakistan is Iran's neighbor. Can you not see why nukes in Iran is a concern?
And if Israel could use a nuke without nuclear retaliation in turn, they would proceed to annihilate half a continent. Once you get hit, it's far too late to retaliate.
Pakistan is establishing preemptive MAD in defense of barrier states, because if Israel does this, they're effectively already dead; they'll have nothing to lose. Israel can call it a bluff, but I personally think they're serious.
As a final consideration, if Israel drops nukes on Iran and is retaliated upon, the US is absolutely not going to start a global thermonuclear war and end all of humanity on their behest. Nor would China ever allow the US to get away with an counter invasion of Pakistan, leaving little other option.
> Pakistan has assured Iran that if Israel uses nuclear weapons, Pakistan will retaliate with nuclear strikes as well.
https://timesofindia.indiatimes.com/world/middle-east/pakist...
But who knows if that's true or not.