Why is the depravity of man important in Christian theology?

The doctrine of total depravity reveals that every aspect of humanity is affected by sin, necessitating divine intervention for salvation. As stated in Psalm 50, awareness of our sinful nature leads to humility and reliance on God's mercy. This doctrine underscores the belief that, apart from God's restraining grace, humanity is capable of the most heinous acts (as evidenced by societal violence). Recognizing our depravity is essential for understanding the need for Christ's atoning sacrifice, as it highlights our inability to earn favor with God and our absolute dependence on His grace for salvation.