Re: Quota system-is it justified: split from Karachi blood bath
On your first point, you are not comparing like for like. For historic reasons, urban Sindh is culturally distinct from rural Sindh. While north and central Punjab is ethnically monlothic, but not south Punjab, where Multan and Bahawalpur cities have mixed Muhajir-Punjabi population, while the countryside is Seraiki.
Your second point is historically incorrect. The reason why the Urdu speakers are concentrated in the Seraiki belt and Sindh is due policies followed by Sardar Shaukat Hayat Khan, minister for refugees of the Punjab government. He made sure East Punjabis were settled in Punjabi ethnic areas, while others sent to Multan or Sindh. He was reponsible for a disgraceful event where he tried stopping the settlement of Meo Muslims from orignally north Rajasthan. So your point on Lahore welcoming all is patently incorrect. In Sindh, Pir Illahi Bux was the refugee minister, and went out the way to accomodate the refugees.
You should take the example of our neighbour to the east, an Indian can study anywhere he wants. There IITs are universally respected, while our institutions are dying because of the quota system.