I think we can excuse humanity from wanting to "learn from our mistakes" so to say, but to keep in mind that nuclear war isn't really a mistake we'd have much option to learn from post-factum. If there's any chance we were close to the brink (and Reagan or not, we were), we need to do as much as we can to focus on what brought us there and how; but unfortunately, this is in contrast to the main learning mechanism for many humans, where without the _actual_ disaster, there will be as much "well clearly there was nothing to fear" ignorance as there is "the sky is falling", and which is more dangerous is in my opinion debatable.