We may be long past holding laureates of the Nobel Peace Prize to its lofty standards — the cruel cynicism of Henry Kissinger and open bigotry of Aung San Suu Kyi are just two instances of honorees behaving dishonorably — but Abiy Ahmed’s belly flop from the pedestal is nonetheless remarkable. In less than a year since his uplift in Oslo, Ethiopia’s prime minister has embroiled his country in a civil war and brought the Horn of Africa to the edge of chaos.