This year is another ominous one for anniversaries. Eighty years ago, the second World War finally came to an end, leaving behind the graves of an estimated 60 million people and a world scarred by destruction and systematic cruelty of a magnitude hitherto unimaginable. One anniversary has already passed. On April 9th, 1945, just one month before Nazi Germany capitulated, the Lutheran pastor and theologian Dietrich Bonhoeffer (1906-1945) was hanged by direct order from the top. His crime? Membership of a clandestine group which had hoped to end the war by their failed attempt on July 20th, 1944, to assassinate...