George Saunders is the most humane American writer working today. He need not ask, as Sheila Heti did in the title of her novel, how a person should be. He knows. A person should be courageous and hopeful, generous and kind. A person should sacrifice herself for the good of those who are more vulnerable. A person should live in the knowledge that life is suffering, and that the most, or least, she can do is attempt to ameliorate the suffering of others. And — this is where it gets interesting — a story should be as compassionate as a person.…