Equation of national sovereignty, which is the moral and legal right to wage war, to the right to self-defense, an existential necessity, is a fraud. A Kellogg-Briand pact is no more a suicide pact than the US Constitution in 1861.
Why should it be a wrong ideal to hold that no nation has the right to wage war on another nation in pursuit of national interest? The implicit answer is the the "nation" is an incarnation of a superior people and these superior people must have rights superior to those others, including the power of life and death, i.e., war.
This is bizarre. What really needs to be argued is the right to make revolution. That truly is an existential necessity! If the freedom of the people truly requires violence, it is revolutionary violence, not wars for policy and plunder, that will save their freedom. The large majority who repudiate revolutionary violence in favor of imperial violence, war as it normally practiced, expose the false pretensions of their moral rhetoric.