If there's ever an example that military power alone cannot be successful in Afghanistan I think it was the Soviet experience.
I feel most empires fell when they started to act human but then look at Russia. They kept a pretty strong hand and they fell from Afghanistan alone because Afghanistan is the graveyard of empires. I guess you just can't sustain it.
Look at the Afghans during the time of the Soviet invasion. They were among the poorest Muslims in the world yet they were sustained by their faith in God and God alone.
'Bombing Afghanistan back into the Stone Age' was quite a favourite headline for some wobbly liberals. The slogan does all the work. But an instant's thought shows that Afghanistan is being if anything bombed out of the Stone Age.