“I think that’s one of the great things that fiction has the power to do: it allows you to create a character, a character you might find despicable or with whom you might not agree, but then give them the power to basically make their case as though they were making it before God.” Elliot Ackerman talks to PBS NewsHour’s Jeffrey Brown about his second novel, Dark at the Crossing (Knopf, 2017), which is a finalist for the 2017 National Book Award in fiction.