”Since China, India, Russia, and who knows, will keep building, the safest course is for the US to help produce the safest possible designs, so that those are built. ” This might be the case, indeed. NK is a difficult problem. Much uncertainty. Certainly would use if struck first. I don't know about second use policy. That is not my domain. Best if not used at all. Want to get there. How do we get to that future? That is my thinking. Process ideas matter. Not my expertise. We need experts thinking across the world.