Back up a moment. Why war? Why do countries or even tribes legalize murder with each other? When the American Indians inhabited the North American continent, long before Columbus discovered them, they went to war continuously. The history of the Hebrew people is continuous warfare. American history is replete with war, every twenty years, every generation.
Why? Why do people WANT to kill each other? IMHO, it is inherent to the species. Look at what is going on now. The Left sits back telling us how they are for the Little Guy, to be benevolent to the masses, looking out for Joe Average. Ha! They are bloodthirsty asshats like everyone else. Look at the violence of boxing, of football where we live, in our own minds, the violence in our hearts.
Folks, how many presidents have made the elimination of war as a major point of his legacy? One!
You mention MAD as a way to eliminate war. War will not be eliminated until it is removed from the hearts and minds of the human race. Just the fact that our study of history is based on the exploits and victories of wars shows where our hearts are today.
And hypocritical Leftists are NOT the answer. Again, they are part of the problem, not the solution.