Dead pan, You're dead wrong about Oman in the 1970s being much different from Afghanistan in the TwentyNoughties.
Oman then, just like Afghanistan now, was a multi-cultural, multi-ethnic, multi-lingual feudal society riven by factional warfare for centuries. Exactly the same set of problems in both cases. Very different approach and results in each case though.
In Oman we did not make the cretinous mistake of attempting to ram a Westminster or Warshington style Anglo-Saxon "democracy" down the throats of a culture which palpably is not capable or willing to absorb such an absurd misfit.
In Oman we did not try to bash a square peg into a round hole. In Afghanistan we react to the failure of the peg to go into that hole by using ever bigger and bigger sledgehammers. It hasn't worked and it won't work because it can't work.
In Oman we did not make the catastrophic mistake of excluding and marginalising 60% of the population by picking a large minority to favour, as this guy is proposing. We did the opposite. We ensured that no ethnic minorites were ever excluded or ever had any reason to feel that they might be excluded. We brought them all onside, even the really difficult ones.
Sure, we always retained the capability to call in an airstrike from the Hunters and Strikemasters, but on the rare occasions when that was the only course of last resort, we always felt that we had failed miserably. There were never any cheers or high-fives when the bomb(s) struck the target. Only a feeling that we had buggered things up so badly that we could find no more intelligent way of interacting with fellow human beings than to bomb them to bits.