I would say that a moral justification would have to depend on how fast AL Q or a similar organization can reconstitute and when American and allied forces leave A-stan , carry out attacks in North America and Europe.
While I dont see a period in the next two years, I do worry that at some point after we leave them alone, they could deploy over here, and start to carry out atrocities in malls and public areas at christmas time, with the same moral justification that we use to attack them.
Its easy to assume that any mob can style itself as the New Al Q, but to have a grasp of logistics, training, morale, experience, then it needs people that have been shot at and survived to go to the next level. So while the generals are important, its just as important to go after who serves in the non-com and field grade officer in their ranks.
Anthropologists might classify them in a tribal role, but those skill sets would translate equally well to a formal military rank. Using drone strikes to kill them, frustrates them without having the ability to strike back and parade a captured pilot or weapons officer in front of the media, and the few times they do bring down a drone, its just a missile magnet for when they do a media op.
I dont have a problem with non-combatants getting killed while in the location of a drone strike, its their war as well. Note how I mentioned non-combatants, rather than innocent civillians, cause I doubt such a thing exists over there. As well, there are times when I think instead of trying to minimize them, we should actively maximize them.
Putting out a notice to the world saying anyone living in this kill box, is subject to arc light strikes. B-52 cells dropping full loads of HE, no jerking around and put the war back into the war on terror. Make the non-combatants an unwilling ally in the region.
If we have enough justification for a drone strike, we have enough for an arc-light mission.
Declan