Thanks for the links. Conclusion 3 in the 'Super-fuse' article is spot on:
Conclusion 3: the real danger to our common future
The real danger to our planet comes not from a sudden technological breakthrough which would make nuclear war safe, but from the demented filled minds of the US Neocons who believe that they can bring Russia to heel in a game of “nuclear chicken”. These Neocons have apparently convinced themselves that making conventional threats against Russia, such as unilaterally imposing no-fly zones over Syria, does not bring us closer to a nuclear confrontation. It does.