The use of force actually came even before the UN resolutions. That is what caused them in the first place.
But the latter wars took out any wind from their sails. It does seem a bit disingenuous to now try to fall back on them after trying all else.
But why are we even discussing that. I don't see even Pakistani governments mention them anymore. So they seem to have realized that they are not worth the paper they were written on.
They were not for a long time. They are not now.
The use of force in Kashmir by both sides (i.e. a territorial dispute) was what led to the UNSC resolutions being issued, I am not sure what your point is with regards to the first Indo-Pak war in the context of the UNSC resolutions being made irrelevant.
In terms of an initiation of 'force', one could argue that it was the Maharajah who first resorted to 'force', by committing atrocities against the Kashmiris when a rebellion (without any Pakistani backing) was initiated in the State. The response from the tribes, the subsequent Pakistani support for them and the eventual war were all a consequence of the Maharajah's actions.
You are being disingenuous by repeatedly ignoring the comments of Nehru that make clear that India had decided to not implement the UNSC resolutions as early as 1951 - the move away from the resolutions was initiated by India, not Pakistan.
In 1965 Pakistan's intention was not to start a war - Op. Gibraltar was intended to start a rebellion in Kashmir and force India move away from its refusal to resolve the dispute - full fledged war however was India's call.
The same with the insurgency supported in the eighties onwards - the goal was to again force India to resolve the dispute. Note that the central cause here has been India's unilateral refusal to implement the UNSC resolutions, starting from 1951, barely 2 years after the she agreed to the resolutions.
India's guilt here and its immoral and illegal position (by virtue of violating the conditions of the IoA and UNSC) is clear from Nehru's comments, and she alone bears responsibility for the resort to force in later years. Your nation unilaterally chose to refuse to honor its pledge in the UNSC, and your nation unilaterally chose to refuse to acknowledge even the presence of a territorial dispute - your nation in essence cut off all and any peaceful/diplomatic avenues towards resolving the dispute, and then compounded the distrust and hate by its unprovoked actions in 1971.
The resolutions are still valid, in that they offer a universally true and fair principle for resolving the dispute - that of letting the people of the disputed territory. Even in the 'out of the box' solutions that have been discussed in the media, Pakistani policy makers, and recently in the Indian media, after the massive protests indicating popular dislike of India in Kashmir, have incorporated the idea of separating AK and Ik from the NA's, Jammu and Laddakh and holding a referendum in that small region.