The cardinal pointed out that this is the answer for the many people who wonder if it is possible to forgive, especially when it is a question of wicked crimes, such as violence against children or the mass killing of innocents.Don't ever let anyone tell you that Jesus's message is that sin isn't real, or that it doesn't matter. What the cross shows is the horrible and extreme reality of sin. Otherwise where is the victory? Where is the power of the cross, if not in its triumph over sin? If there is no sin, then why did our Lord suffer and die? Why is he now and forever "Jesus, who was crucified" (Matthew 28.5)? If sin is false, then the cross is a false victory.
And, along with what Cardinal Stafford said, it is cruel to deny sin. How can you tell some poor twelve year old Rwandan girl, whose family was hacked to death in front of her, who was raped and left for dead, that there is no such thing as sin? Saying such a thing would be laughable if it weren't so cruel to those victimized by sin, who have become (like Jesus) intimately acquainted with sin's horrible reality, who have been "made perfect through suffering" (Hebrews 2.10f). MM has said this many times, and I believe it.