We can all agree that helping others is great, a deed worth doing. But devoting too much to helping others – too much time, too many resources – may get you labelled an oddity, a freak. How much can morality demand of us? Is it good to live as moral a life as possible, or do we lose something – devotion to one’s family, for example – by adhering to extreme moral principles? Can somebody be both fully rational and also a saintly type? John and Ken lend a hand to New Yorker writer Larissa MacFarquhar, author of Strangers Drowning: Grappling with Impossible Idealism, Drastic Choices, and the Overpowering Urge to Help.