Such is the title of an excellent article from The American Interest, which addresses the change of focus in American society to the fulfillment of the individual. I won't excerpt it, although I'm inclined to do so, because it's worth reading from front to back.
A question that might open the discussion is whether "selfishness" is the right word. The author of the article prefers it; the sociologist he is critiquing prefers "the virtues of living lightly." Is "living lightly" in this sense an actual virtue?