Socialized morality was not significantly developed prior to Christ's time. However, it was the primary focus of what Christ taught. Before then, Isaiah and Jeremiah certainly mentioned socialized morality, saying that the oppression of the needy was the primary cause of the demise of Jerusalem. But they could not develop the complexities of the subject, as demonstrated by Christ's teaching. To understand this, we must consider the evolution of reality.
All constructive realities evolve.
This includes truth, knowledge, technology, biological life and social institutions. Designing that evolution is a large part of God's work. We'll look at some of the major elements of the evolution of moral concepts, because the evolution is quite informative. One of the points of Genesis is that there were no moral rules to go by at that time. The response to sin was usually more sin.