We're often told to put ourselves in someone else's shoes. Yale University psychologist Paul Bloom doesn't buy it. He says new research points to some of the downsides of acting on empathy. Good intentions can be a poor substitute for real moral reasoning. Bloom makes the argument that ethical judgement based on empathy focus on one person's suffering and ignores the big picture. His book is called Against Empathy: The Case For Rational Compassion.