" It is often a puzzle for foreigners why the United States has such a dismal performance when it comes to murder, guns, and mental illness, all features of American life that, when compared to most of the other wealthy countries, are so awful they do not require further documentation. You might wonder how those bad results square with America’s relatively strong performances on most social capital indices, such as trust, cooperation, and charitable philanthropy; on philanthropy, we even rate as the global number one. The truth is that those positive and negative facets are two sides of the same coin: Cooperation is very often furthered by segregating those who do not fit in. That creates some superclusters of cooperation among the quality cooperators and a fair amount of chaos and dysfunctionality elsewhere. "

― Tyler Cowen , The Complacent Class: The Self-Defeating Quest for the American Dream