Anomie
Anomie occurs when the norms and values that unify society (social solidarity) have broken down and given rise to a state of normlessness. The term was popularised by the Functionalist sociologist Emile Durkheim in his ground breaking work Suicide (1897).
Robert K. Merton states that anomie is a state in wich social goals (like getting rich) and socially acceptable behavior differs. (Honest work won't always make you rich.) The lack of correspondence is what gives rise to deviance.
Anomie is usually prevented by the various primary and secondary institutions in society, such as education and the church; also by the fact that most people are sane and thus recognize the existence of some common-sense values that remain in effect even when the traditional keepers of moral order have lost their credibility.