Therein lies the great danger - much greater than events preceding WW1 or WW2. With the US (and most of its people) proven dishonorable / selfish and worthless, and its protective umbrella discredited (or becoming so fast), any country capable of going nuclear doesn't really have much choice but to do so. With many nuclear powers in the world, the chance of a miscalculation leading to a significant nuclear exchange becomes a virtual certainty.
Pretty soon, it will be like the Far Side cartoon.....”Look Marge, the Hendersons now have the Bomb.”