I get a few takeaways from this, one of these being that progress, people foresee (or think they foresee), will turn out to be a merely forward thing, where we can only get better at inventing, which means better tech, which means the ability to improve how we destroy, and another being that nation states, themselves having been a can of worms on their own when tribes contemplated no longer being tribes, will be targeting other nation-states, but that tribes, being nomadic and not as technologically in-tune, would have less incentive to be struck down by a nuke, as would city-states to a lesser degree due to the second thing and/or the fact that everyone existing in the form of city-states might make people more careful.