These are tough days for Guernica. Not Picasso’s painting, which, last we checked, is on view at the Reina Sofia museum at Madrid. The magazine that takes its name, though, is tearing itself apart joint from joint over the publication of an essay that dared to acknowledge the humanity of Israeli Jews. In the process, Guernica has come to resemble less the ostensibly pro-democracy Republicans of the Spanish Civil War than their fascist opponents.