In 1965, Daniel Patrick Moynihan warned that the rapid breakdown of the family, especially the rise of fatherless homes, would create social pathologies that no amount of government spending could cure. Just three years later, researcher John B. Calhoun gave the world a chilling demonstration of the mechanism. 

Calhoun built “Universe 25,” a mouse colony with unlimited food, water, nesting material, and no predators. At first, the population exploded. Then normal behavior disintegrated. Mothers neglected their young. Males withdrew into violence or apathy. Fertility collapsed. Even with abundant resources, the colony spiraled toward extinction. Calhoun called this collapse “behavioral sink.”