Photo: Sony Pictures/YouTube Once again, Danny Boyle and Alex Garland have made a thinker about the brainless undead. Or rage virus-infected differently alive, whatever. 28 Years Later is the latest zombie movie/geopolitical rumination from the writer-director team. And critics have found a lot to chew on. If 28 Days Later was a reaction to 9/11 and the eruption of sectarian violence disrupting the “end of history” idyll of the 90s, and 28 Weeks Later was about forever wars and police states,