Partially the problem is politics. Higher population mean more seats in provincial and national assemblies. But none of 2 previously now 3 major parties capable

Partially the problem is politics. Higher population mean more seats in provincial and national assemblies. But none of 2 previously now 3 major parties capable of forming a national government win many seats in Karachi so have little interest in fixing the census or the problems people of Karachi face. Even the army when it takes over power is not fond of Karachi as it was the one city that voted against the first military dictator.