How much information do we need from the darkest places of the world? That’s one of several questions posed in “The Pen and the Sword: Reporting ISIS,” a paper by Paul Wood, a BBC correspondent and 2015 Shorenstein Fellow at Harvard’s Kennedy School. Wood details ISIS kidnappings, and his own reporting on conflict in Syria. He raises difficult questions about a journalist’s duty. Is too much information unnecessary to make your basic point? Can neutrality be a mistake when there may not be two sides to a story? Should one offer rallying cries to your audience to take action? Is there a tricky line between reporting and propaganda?