Before the UN, two countries could go to war and nobody else would care. "If they want to go to each other's throats, let them." War was seen as a legitimate ex

Before the UN, two countries could go to war and nobody else would care. "If they want to go to each other's throats, let them." War was seen as a legitimate extension of politics, not as an absolute last resort only valid for self-defense. This could probably still be true at least for non-nuclear powers. Instead, we at least try to intervene and stop the fighting. So this argument is not so much about the UN as an institution but about this paradigm shift to see war as something bad that must be stopped ASAP, even if your own country is not involved or in any danger of getting involved. Or short: War is illegal.