The entire purpose of nuclear armaments is to make certain wars too nasty to fathom engaging in. If their organization didn't exist at all, we'd still have exactly the same number of nuclear war casualties since the 1940s.
Interdependence via global trade makes it unlikely that without nuclear weapons we would have nearly the number of wars we had in the 1940s.
The net result of this has enabled nuclear powers to engage in asymmetric wars against countries that don't have nukes, or to engage in proxy wars between nuclear superpowers. Meanwhile, we heave come perilously close to nuclear armageddon, with Stanislav Petrov standing in the way.