Most destructive would be attack on ideology of Islamic welfare state, for which we Punjabi, Sindhi, Pashtun, Baloch, Kashmiris are united, Otherwise a Pashtun have more to do with Afghans then with Sindhi, Punjabis and Baloch, a Punjabi have more in common with Sikhs and Paharis then any Sindhi, Pashtun etc..a Sindhi have more in common with south Punjab then another, same goes with other ethnic groups too...
Islam bind us stronger.. Secularism, ethnic, regional politics is recipe of disaster as it proved in 1971.
Even now most Pakistani rate ethnic political groups as traitors, whether we talk about MQM, ANP, PKMAP or Baluch Nationalists..