Michael Kretschmer, prime minister of the German state of Saxony, knew he was entering the lion’s den. But even he looked unprepared for the boos, whistles and catcalls that greeted him in Chemnitz, a city boiling over with rage and hurt. Addressing a town-hall meeting of locals reeling from the murder of a 35-year-old man in the city last weekend, Mr Kretschmer insisted they should have distanced themselves from the rightwing extremists who hijacked their peaceful protest over the killing, which authorities suspect was carried out by a Syrian and an Iraqi. “It’s not a good thing to be in a...