The world is full of suffering. How far should you go to prevent the suffering of others, especially the suffering of strangers? Ought you spend way too much to enjoy a fancy coffee drink while children are dying of starvation? Larissa MacFarquhar discusses extreme altruism, illustrating her points with a fascinating example. “In wartime – or in a crisis so devastating that it resembles war, such as an earthquake or a hurricane – duty expands far beyond its peacetime boundaries. In wartime, it is thought dutiful rather than unnatural to leave your family for the sake of a cause. In ordinary times, to ask a person to sacrifice his life for a stranger seems outrageous, but in war it is commonplace. Acts that seem appallingly bad or appallingly good in normal circumstances become part of daily life. This is the difference between do-gooders and ordinary people: for do-gooders, it is always wartime. They always feel themselves responsible for strangers; they know that there are always those as urgently in need as the victims of battle, and they consider themselves conscripted by duty.”