The punch that floored Joseph Brandner, 34, at 11.30pm on 24 August was the start of it all. Three men wearing Division Deutschland T-shirts, a brand associated with neo-Nazis, had walked up behind him as he was enjoying a drink with friends at a beer table outside the Kuckucksnest bar in the Bavarian alpine town of Berchtesgaden. Brandner – who has been learning-disabled since being hit by a car at the age of 17 – was sucker-punched to the ground. “Wankers!” screamed his tattooed assailant. “Come on – three on three.” Brandner’s two friends, including the owner of the bar,...