Well, one course of action is to try to get a friendly goverment in place running things, as the coalition has been trying to do in Iraq.
All fine and dandy, but the place doesn't quiet down quite as you would hope. Then a couple of your soldiers gets arrested. What do you do then?
You break into the prison with a tank, release your two soldiers (along with 150 other inmates).
*BEEP*, Wrong answer.