Once you consider relative transportation infrastructures, Afghanistan is far enough away from anything we give a damn about--the Balkans are RIGHT NEXT to the Mediterranean and Europe, two areas that we DO care about.
The "Great Powers" were dragged into this one the same way you would have to drag a fish into water. I think that's part of the problem, we keep imposing these artifical borders on them, hence the problem keeps comming up. We should have just stayed out of it and let them settle it themselves. Unfortunately, Bill left a stain on Monica's dress and the rest is history.