IMO it is not a matter of 'what if', but 'when they'. Digital is the new world, the new weapon and the next stage of nearly everything in human evolution. It is simply terrifying to know what could be done if terrorism or warfare was conducted with bytes not bombs. Technologically speaking, we have gone well beyond the know how it would take to destroy the planet without old fashioned weapons of mass destruction. A massive EMP, an intentional spiking of the grid, false data injections... so many possible ways to bring the planet to its knees with the push of a button.... scary