Are You Worried About Nuclear War?

I would say, if 7 billion humans get killed this year in 2018 by some stupidity, it's probably going to be nuclear war between the US and Russia that was a cause. And it will most likely have started by accident. But if instead a similar number of deaths happen in 50 years, then I think it's more likely because by AI. There are also links, of course, because if we put ever more of our infrastructure and weapons under the control of computer systems. So where about do you rank those two? Which one is higher priority than the other?