You've jumped down the rabbit hole for no reason. Tell me, this is the Pakistan Afghan border natural? It is normal for a border to have the same families on either side? The Pakistani/Indian border drives right through the middle of Punjab, is that normal? The Balouch people are split between Pakistan and Iran, Do you think this is an acceptable way for a border to be?
Do you never look at the straight lines of the middle east and Africa and consider whether those borders make sense? Today we have Turkey, when the Ottomans setup this state the territory of the the people who form todays turns included Syria , parts of Iraq, some parts of Iran, central Asia, the people of the same ethnicity, religion, identity were settled in those lands. Today those lands are straight linesin deserts dividing people who have no business being divided.
Pakistan is the same. The Pakistani Muslim identity we harp on about has as much to do outside our borders as it does inside. The kings we read about in our history books had capital cities in Kabul and Delhi as well as Lahore. Pakistan is unfinished business. We were weak at partition, we got what we were given, not what we wanted. Don't be stupid and turn a blind eye to what Pakistan was envisaged to be.
The divisions within us were created by our enemies very deliberately. Do not fixate on them, fixate on the rope Allah asked us to hold onto. If you cannot have love for the Muslim in Kandahar or the Muslim Assam, or the Muslim in Kerala, or Gujurat, don't pretend to care for the Muslim in Kashmir. Think about whether your love is for your brother or for the territory. Dont take that as a personal attack, it's not intended to be.
Someone else quoted the name of a bunch of molvi who are anti Pakistan i assume - so what? If the devil wears a beard and a sherwani will you not recognise him for who he is?
And hold firmly to the rope of Allah all together and do not become divided. And remember the favor of Allah upon you - when you were enemies and He brought your hearts together and you became, by His favor, brothers. And you were on the edge of a pit of the Fire, and He saved you from it. Thus does Allah make clear to you His verses that you may be guided. - Holy Quran 3:103