Dogg, you're absolutely right concerning the the rule for keeping God's vengeance his own, but as far as justified interventions are concerned, you can't condemn the country or its corresponding citizens in taking up a cause that's proponent of war from a Christian viewpoint. God himself told the Jews to battle and kill the Canaanites. And simply saying that because the Old Testament didn't emphasize Christ's point regarding God's vengeance, that doesn't dispel the inherent principles that make up the rules, which have been in effect since the beginning of time (I'm referring to causality).

Christ tells us to turn the other cheek, but not to remain accessory. If someone's beating up a defenseless innocent--Perhaps to the point of death, how would God feel towards someone simply standing there and doing nothing?

I find it safe to say that God condones and encourages the taking up of arms against another country in the name of your own if the the very country you reside under sponsors component Christian philosophy and acts based upon those (at least) inherent ideals as ordained by The Christ. The Iraqi War, for example, I find, goes under such categories. President Bush sought to protect other people, mainly Americans, from WMD threats. There was also the ulterior motives of freeing the Iraqi people.