I saw the CB's actions as preventing a war from starting. Their stated mission is to eliminate war, not save the weak or rescue the oppressed. If they had done nothing the Union would have likely attacked that little country and there would have been a war, instead CB attacked and destroyed much of the little country's fighting potential, forcing them to negotiate. The end result is that the Union gets back what it lost without firing a shot and no one but CB got any blood on their hands.

The thing the show seems to like ignoring is that even without a high tech military the little country's people probably still don't like the Union and a portion of them would be likely just resort to terrorism style tactics instead of overt military action if this situation were to occur in real life.