Civilisation.
Punjabis, in particular, have a culture very high in power-distance. They were prostrating themselves to kings and paying taxes to build palaces when Europeans were still wearing skins and living in caves.
(Balochis and Pashtun are very different, I hasten to add, but they are small minorities.)
Pakistan's dictator will do exactly what serves his interests best.
And the overwhelming majority of his people will take it.
