Agree with what you have said about police force. Overall law enforcement agencies are very well coordinated and most importantly have complete support of locals. That makes them much more effective.
The killing of Shia (the bus/van targeted near Jalkhand area on way to Babusar Top) were not Kohistani people however. They were terrorists. Still, this do not make Kohistan or Kohistani people peace loving, they are illiterate and criminal minded, most of them. Thus would be easier for terrorist gangs to exploit, they will side with anyone who can pay them! Money is the religion really for those people. However do not, ever, mix up Gilgit-Baltastani people with the Kohistani guys from Kohistan area. They are totally different breed. Gilgit-Baltistan people are some of the finest you will come across, very united, educated and friendly.