Your points have a lot of weight. I look at this from this point of view. Just imagine if India, A-Stan, Iran and Israel decide to targer Pakistan together and simultenously.
Now it is just NOT possible for Pakistan to handle all these MULTIPLE FRONTS USING CONVENTIONAL MEANS - IT IS JUST NOT POSSIBLE. The only way for Pakistan to survive would be to nuke A-stan, Iran so that these 4-fronts only become two fronts. Now Israel can only use Airforce - Pakistan can easily counter it. Pakistan can then use all of its conventional and non-convention means to take care of India !!
IN A SCENARIO AS ABOVE - USE OF NUKES BECOME IMPORTANT FOR THE SURVIVAL OF PAKISTAN. People do not realize that In fact Pakistan is PRESENTLY FACING ALMOST THIS EXACT SCENARIO minus Iran who have learnt the hard way that Indians are NOT their friends!!