I think there are several things happening here. 1. People feel "we won the cold war, so the threat of nuclear war is past". I do not think they are entirely w

I think there are several things happening here. 1. People feel "we won the cold war, so the threat of nuclear war is past". I do not think they are entirely wrong (the risk is still much lower) but its complacent to ignore it. I think it is worsened by people clinging to "end of history" theory. 2. Campaigning against nuclear weapons was far easier when the west was winning the cold war and dominated the world economy. 3. People who are worried about existential threats as now focused on climate change. People seem to be able to worry about only one big threat at a time. There are a number of others (space weather is another, pandemics were until we got a rude awakening) that get ignored.