Nobody said it was going to be easy, but they found people to serve in Bosnia. If they can find people willing to serve in that sniper farm, they can find people willing to serve in a mine field.
In any case, a real UN peacekeeper force would have an easier time then a pure US colonial force. And handing the country back over to the Northern Alliance isn't solving the problem. It's just pushing it off for another generation, if that long.
Jay