Germany's director general of legal affairs Tania von Uslar-Gleichen speaks to journalists at the International Court of Justice in The Hague. Photograph: Robin Van Lonkhuijsen/AFP via Getty Images The easiest way to unsettle Germans these days is to ask them what they understand by “nie wieder” – never again. Over the last decades, those two words have served as elegant shorthand for German memory politics on the Holocaust. But is the understanding, and promise, behind “nie weder” that mass murder of Jews must never happen again? Or is “nie wieder” a solemn vow by Germans not to carry out, or...