You seriuosly need to read the old newspapers, espacially the Swat Pact, so that you can first undersatdn that actually is going on.
PA was withdrawn from those areas when the deal was enacted, thereby leaving the area in the hands of locals.
Now there is a long story behind the reason why those people don't like the Army to operate there. It's kinda autonomous area, though it don't form part of FATA, but still the local elders and sardars have alot of say there.
You probably will not understand it as it would be a news for you that how can two form of governance operate in a country, but that's how it is. Read something about FATA on the internet.
This may help you :
FATA [ Federally Administered Tribal Area ]
i again repeat Buner don't come under FATA but the entire NWFP less the metropolitan cities like to and enjoy much independence, but this doesn't mean the government don't have a say there!!