What is the main topic of the passage?

My teenage son recently informed me that there is an Internet quiz to test oneself for narcissism. His friend had just taken it. "How did it turn out", I asked. "He says he did great!" my son responded. "He got the maximum score!"
When I was a child, no one outside the mental health profession talked about narcissism. People were more concerned by inadequate self-esteem, which at the time was thought to lurk behind nearly every issue. Like so many excesses of the 1970s, the self-love cult spun out of control and is now rampaging through our culture like Godzilla through Tokyo.
        A 2010 study in the journal Social Psychological and Personality Science found that the proportion of college students exhibiting narcissistic personality traits — based on their scores on the Narcissistic Personality Inventory, a widely used diagnostic test — has increased by more than half since the early 1980s, to 30 percent.
        In their book, The Narcissism Epidemic, psychology professors show that narcissism has increased as quickly as obesity has since the 1980s. Even our egos are getting fat. This is a costly problem, they wrote. While full-blown narcissists often report high levels of personal satisfaction, they create havoc and misery around them. The book points out that there is overwhelming evidence linking narcissism with reduced honesty and increased aggression. It’s notable for occasions like Valentine’s Day that narcissists struggle to stay committed to romantic partners, in no small part because they find themselves superior.
        The full-blown narcissist might reply, "So what", but narcissism isn’t an either-or characteristic. It’s more of a set of progressive symptoms (like alcoholism) than an identifiable state (like diabetes). Millions of Americans exhibit symptoms, but still have a conscience and a hunger for moral improvement. At the very least, they really do not want to be terrible people.
        A healthy self-love that leads to true happiness builds up one’s intrinsic well-being, as opposed to feeding shallow cravings to be admired. Cultivating amour de soi requires being fully alive at this moment, as opposed to being virtually alive while wondering what others think. The soulful connection with another person, the enjoyment of a beautiful hike alone, or a prayer of thanks over your sleeping child could be considered expressions of self-love.