There are all kinds of people in the Tribal Areas. There are many supporters of the Pakistani regime, but there are also many people/tribals who feel they are 'Afghans', & want to help out their brothers on the other side of the border. That doesn't make them anti-Pakistan, but when they see the Pakistani establishment approving US drone strikes against them, they feel betrayed by the Pakistani establishment. Drone attacks by the US forces will only further exacerbate the internal security of Pakistan. The Pakistan Army itself needs to go inside these Tribal Areas & attack these anti-state extremist elements in the FATA. While the drone strikes kill a few terrorist leaders, they kill a lot of civilians, & this results in more terrorists being created than destroyed. That is not good enough for Pakistan. Even if there is some kind of way that ensures ONLY terrorists are killed in the tribal areas, there will still be high anti-American & anti-Pakistan establishment feelings rising in these areas.
So drones are no solution at all. However, the anti-state extremist elements in the FATA regions must be tackled. Most of the people are 'on the fence' in the fight between the terrorists & the Pakistan Army/US. With drone strikes, the common people get pushed onto the side of the terrorists against the Pakistani establishment. They feel betrayed by the Pakistani establishment & think it's a pawn of the US. This was the reason why the TTP was formed in the first place.
if pa goes after terrorists in FATA, there is no way that the civilians not to get killed.