Nuclear bomb dosent help anything or anyone
it is a deterrent, it is a safe guard for Pakistan
Pakistan's main enemy is India & Pakistan needs to be able to do two things, be able to hit every part of india and ensure they have enough missiles and war heads to destroy india taking into account 1st/2nd/3rd strike and weapons survivability
In the last 15 years or so India's economic rise has enabled it to expand its military and buy weapons like never before
Pakistan cant allow India to feel that any adventure on its part would go unanswered, so Pakistan at great pain has taken steps to expand our military, nuclear and missile arsenals.
Even though due to financial/political/diplomatic contraints Pakistan hasent been able to push ahead with all desired projects, the basic work is on going so as soon as the economic situation gets better and funds become available we can pick up & achive the intended aims i.e, subs, longer range missiles etc