On Civil War.
The scariest single conversation I’ve ever heard in my life was five Special Forces guys having a fun thought exercise about how they would bring a major American city to its knees.
They picked Chicago, because it was a place they’d all been. It was fascinating, and utterly terrifying. And I’ll never ever put any of it in a book, because I don’t want to give crazy people any ideas. Give it about a week and people would be eating each other (and gee whiz, take one wild guess what the political leanings of most Green Berets are?).