https://en.wikipedia.org/wiki/List_of_nuclear_close_calls https://en.wikipedia.org/wiki/List_of_nuclear_close_calls http://www.ucsusa.org/nuclear-weapons/hair-

https://en.wikipedia.org/wiki/List_of_nuclear_close_calls https://en.wikipedia.org/wiki/List_of_nuclear_close_calls http://www.ucsusa.org/nuclear-weapons/hair-trigger-alert/close-calls#.WMXGgZAzXaM http://www.ucsusa.org/nuclear-weapons/hair-trigger-alert/clo... https://www.theguardian.com/world/2013/sep/20/usaf-atomic-bomb-north-carolina-1961 https://www.theguardian.com/world/2013/sep/20/usaf-atomic-bo... It's such a complex network of systems and people and policies; all of which is constantly in flux. All of which has to yield a perfect result, every time. You can argue about robust systems, but the reality is that these systems are far from robust. Look at what happened when the USSR collapsed for god's sake! We're still cleaning that up.