Nuclear weapon use isnt like the horrific things we see today though. Its something that 1. The powerful are also fearful of, and that they wont be spared from, and 2. Something that does extreme damage not just to humans but to economies, and infrastructure. The horrors of today are squarely placed upon the shoulders of the downtrodden to bear the weight of so those in positions of privilege find it easy to ignore them. But have Los Angeles wiped off the map in an instant and that wont be so easy to ignore. Look to 9/11. The death toll wasnt even that high compared to other atrocities that have happened since, but it has a lasting and profound effect on the western worldview and policy because it effected those who should be immune to the woes of war. In their metal towers, with all their wealth, their blood flowed. Thats what they fear. The same way war in Ukraine caused so many to freak out but war in the middle east is seen as expected. Its too close to home. Once the powerful dont feel safe anymore they will agree to peace.