It's hard to explain, something of a mystery, as to how the suffering and death of Jesus redeems humankind. It's first hard to understand why this gentle man was tortured in this way. But in each person who tormented Jesus stands for you and me. The mocking and teasing? How about that nasty office gossip you passed on. The beating and physical abuse? How about when you became so angry as to threaten someone physically--or actually struck someone. We are all represented by the mob of Roman soldiers, Jewish clergy, Roman and Jewish citizens present in the various settings of Jesus' prosecution and death.
Somehow, through the grace of God, this gory death redeems fallen and sinful humanity. Whether you think of it as Christ taking our punishment, or His suffering being so awful that we look at it and vow to be like Him instead of like that ugliness, or any of a thousand other theories that attempt to describe the theology behind redemption and salvation, to borrow the last words Jesus said on the cross, it is finished, the curtain of separation between God and humanity has been torn in half from the top and we can come in a spirit of humility and sorrow and have a true relationship with the Creator.