The recent "debate" over intervention in Syria and Libya illustrates much of this. One side wanted to invade, the other side just wanted to bomb the bejeezus out of them. That's the extent of the spectrum. The option that Matías mentioned of not attacking other countries doesn't even enter into the conversation.
I see pacifist positions like Tex's refusal to fight ever as being utterly impossible to defend morally. But then look at what Dirtboy said: he would fight to defend the US its people or its assets or its allies. And this was in response to my having given a very abridged list of countries where the US military has committed unrestrained atrocities. Look at that list again: when did Iraq, South Vietnam, Laos, Cambodia, Panama or anyone else attack the US its assets, people or allies? And I didn't even list half of the countries the US has attacked. And in every attack there are always atrocities committed by the troops. So much so that it makes the ROE look kind of ornamental. Hell the Japanese Empire had ROE too.
There are cases of wars that could even be classified as humanitarian interventions, but the US has never fought in any of them. Instead it is consistently guilty of the international crime of aggression, what the Nuremberg court referred to as " the supreme international crime, differing only from other war crimes in that it contains within itself the accumulated evil of the whole."
I am curious as to why you think pacific resistance is impossible to defend morally? I think violence and war are impossible to defend morally. Please note that pacific resistance does not mean to sit on your hands and do nothing. It means to resist, but without any forms of violence. When you use violence in war, here are some of the consequences:
1. Innocent people are almost always killed that have nothing to do with the conflict.
2. Almost always, those that participate in the war do not adhere to wartime rules and do something despicable beyond killing enemy troops.
3. Violence brings a toll financially upon the country where the war is at after the war.
4. It also causes problems financially for the other country, too.
5. The participants in the war's lives are often ruined by the things they were forced to do, after the war is finished.
6. Almost always, there is a propensity to want revenge. This creates a perpetual cycle. For instance, al Qaeda destroys the world trade center, then we invade Afghanistan, now al Qaeda will attack the United States, and then the United States will attack Al Qaeda. The only way to break the cycle is forgiveness, and that can take a very, very long time.
7. Violence in and of itself is morally wrong. It is wrong to murder someone. I am not saying that war always equates with murder, but the point here is that it is morally wrong to commit violence in and of itself.
I could go on. Non-violent resistance, however, has been proven to be effective when done in large numbers and in an organized way. If you can accomplish the same thing, a correction of an injustice, and use non-violent resistance to do it, then how is it morally inferior to violent resistance?
I would certainly like to know what you think on this. How is violent resistance morally superior to non-violent resistance?