Well the thing is, India had to go to full scale war with Pakistan and win, to secure Bangladeshi independence.
Pakistan's chances of beating India in a conventional war are very slim, in a more likely scenario Pakistan will receive massive reverses in conventional conflict with India and might resort to using nuclear weapons, just to ward off a humiliating defeat. And if the war goes nuclear, Pakistanis will loose Pakistan before it can win Kashmir.
So question is ..are Pakistanis willing to loose Pakistan for sake of getting Kashmir?
To your point of that why India started "all" this in 71..is based on a wrong assumption..hadn't Pakistanis sent its troops to wrest Kashmir from India in 65(and the process making India a sworn enemy), India might have never interfered in Pakistani internal matter in East Pakistan.
So essentially it was your greed for more land, which led you to loosing half your country.
So are you smart enough to learn from your past, or your greed for more land, your in-contention with what you have, lingers on??