Every book for me is an exorcism in some way or another, working through my feelings at the time.
I think the American people are very smart in understanding our country is very trustworthy with nuclear weapons. We've had them from the beginning. But they have also been critical for keeping the world more at peace than it would have been if it hadn't been for the American nuclear umbrella.
From a scientific perspective there is some indication that a nuclear war could deplete the earth's ozone layer or, less likely, could bring on a new Ice Age - but there is no suggestion that either the created order or mankind would be destroyed in the process.