‘Civil War’ Review: Alex Garland Tears America Apart, Counting on Divided Audiences to Prevent His Worst-Case Horror Show

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, …