Why did the postwar consensus of the 1950s break down?

In the early 1960s politics and society in prosperous western Europe remained relatively stable. East Bloc governments, bolstered by modest economic growth and state-enforced political conformity and committed to generous welfare benefits for their citizens, maintained control. As the 1960s progressed, politics in the West shifted noticeably to the left, and Social Democratic governments worked to normalize East-West relations. Amid this more liberalized society, a youthful counterculture emerged among the children of affluence to critique the status quo. In the East Bloc, Khrushchev’s limited reforms also inspired rebellions. Thus activists around the world rose in protest against the perceived inequalities of both capitalism and communism, leading to dramatic events in 1968, exemplified in Paris and Prague.