The biggest movie in the country right now is about a civil war — in America. If you see the film “Civil War” at a theater in downtown Washington, the scenes of the Lincoln Memorial exploding and the White House being attacked are jarring when you exit into the D.C. air. The movie is writer and director Alex Garland’s very in-your-face attempt to imagine the unimaginable in America — an authoritarian leader in the White House, intractable political differences being resolved through violence and the very specific horrors of modern warfare — urban fighting, refugee camps, mass atrocities, the collapse of the currency — all the things that we associate with stuff that can happen over there happening right here in the United States. “Civil War” is also a movie about journalism. It follows four reporters traveling from New York to Washington, D.C., via a circuitous route through Pennsylvania, West Virginia and Virginia. The movie takes on a lot of the weighty issues we talk abou...