It's the same counter intuitive argument MQM used to throw out, why would we engage in extortion, kidnappings and killings in our own city, why would we want to harm peace harmony and prosperity of our city.
Same philosophy that MQM applied to Karachi, establishment is doing the same, i.e. a chaotic and dysfunctional Karachi is in better interest of establishment control at the center.
In spite of the chaos and neglect, Karachi still contributes 56% of the total federal revenue, let that sink in.
A functional and prosperous Karachi has the potential to contribute up to 75-80% of the revenue if not more...
And that's what the establishment fears, i.e. Karachi living up to its full potential will render both Central Punjab, Lahore and Pindi et al irrelevant side shows.