In other words, depending upon the situation, it can be right.
Based on the portion of the CCC I read, even if the situation “justified” action, it seems someone could say that the church has not given permission for civilians to defend one another. Unless, of course, there is further teaching about this. Someone could interpret the CCC to only allow for military and law-enforcement to use force in defending others and thus condemn a man who killed in order to save the life of a friend for instance. That doesn’t seem like the intention of the CCC’s teaching but the wording allows for that misuse as far as I can tell.
Assuming the situation called for defending another, what principle would justify and/or require defensive action?
Is any such principle said to justify or require defense of others in the catholic church’s teaching?