Peter Debruge Chief Film Critic The press are the good guys, but also kind of the bad guys, in Alex Garland’s virtuosic “Civil War,” a jarring ground-level account of what a near-future disunification of the United States might look like. Intended as a wake-up call, the long-fuse thriller — which starts slow and snowballs to a jaw-dropping raid on Washington, D.C. — embeds viewers alongside a dedicated team of journalists making their way to the Capitol while the country unravels around them.