I mentioned it before, when the system's design is no longer adequate to support our world, then the imbalance caused by it can be seen as ripples in various forms of calamities. One such event anyone could notice is war, and it will take global stage to get noticed. System might be trying to forcefully equate unbalanced till it finds balance again. It's the way of System announcing the need for change.
System never assumes a fixed way of going forward. It aways improvises. There is no right or wrong way to achieve greater things considering its present restrictions. But a wise choice that we get is to create better contingency plans knowing its way of getting things done. Keeping that in mind, what would be the right mindset to deal with wars if it happens someday? Disarming every person in our planet is not viable as no one would give up their power which is the source of their own supremacy/defence. Other side would be arming every person in the planet so that no one would dare to swing swords at each other. In that sense I would say arming every country with nuclear weapons is the right way for everlasting peace. No nation should be a slave to another and no one would threaten each other if they have fear that a smaller blow from the weakest itself will take a big toll even to the mighty ones. But keeping arms from terror groups can be a challenge but doable, I believe. May be organizations like UN can contribute to formulate this. This is my personal opinion and would like to see how things fall in place once the System open up to the world. Nations are greater representation of human culture/perspectives and preserving it by keeping it as original is needed in every way possible.