See the previous poster. But, IIRC, just war theory depends on the idea of legitimate self-defense. A nation is fighting a just war if (a) it is the nation being attacked (that is, the war is defensive in nature), and (b) the leaders try to minimalize civilian casualties to the greatest extent possible (today, of course, it’s nearly impossible to avoid civilian casualties altogether, especially when attackers are using civilians as human shields and when civilians can be forced to fight as soldiers - but tactics that deliberately target civilians, such as the atomic bomb or “concentration” death camps, are intrisically evil).
It seems to me very problematic to consider war in terms of self defense, because nations are not people, and what is defensive as a nation, will generally involve aggression on an individual level.
Robyn P wrote: "If we had phasers with the ability to effectively stun or kill enemies, for example, I believe the Church would say set them to stun since in that case, that would be sufficient. Killing always must be the absolute last resort.
“Also, killing in war actually would fall under double-effect. The intent of a just war isn’t to kill the enemy, but to defend the innocent. Sometimes the only way to do that is to kill, but that’s not the intent, the intent is to incapacitate the threat. Again, if that can be done non-violently, or at least non-lethally, that’s a different story. But if there’s really no other option, it’s legitimate.”
Thank you. This is very helpful. Why isn’t this included more explicitly in the criteria? That would have helped.
Johnmann said: “Self-defense. Repelling an unjust aggressor, even with deadly force if necessary, isn’t considered evil in the first place so isn’t using evil to accomplish good.”
Only if the unjust aggressor was attempting to murder, and their death was not the intention. Self-defense couldn’t excuse common tactics such as ambushing enemies at unawares.
Polytropos wrote: “Killing is not necessarily an evil, so it is not the case that an evil is the means to the end.”
I’m pretty sure that killing a human being is always an intrinsically evil act, and that is why the Church is consistently pro-life, including on the death penalty. In the case of the death penalty, there is the opportunity to kill the very guilty, but this is not allowed as a neutral act, and to not kill them is “more in conformity to the dignity of the human person.” (CCC 2267), so to kill them must be less, and therefore wrong (if without necessity).
I do get the horrible feeling that it is just rationalising our crimes. Honestly, what soldier taking their shot hopes that their enemy will survive? I expect very few. How many know the doctrine of double effect and how many are applying it as they consider their commands? War would be very different if they did.