Does that sound fair that the sinless Savior, the Lord Jesus Christ to be the one made sin for man? By the human point of view, it is not fair. In the default justice system, sin must be punished. But do you realize why the Son of God became the sin sacrifice. It is because the sin of man no matter how big or how small cannot be paid by man's own effort. James 2:10-11 says that if we break even one of His laws, we already are fallen short. The only way to pay for your sins without Christ's mercy and by yourself is to spend an eternity in Hell. There is no way that one's own natural goodness will ever deliver them.
The whole message of the crucifixion is that Christ died for my sins so sin would be defeated. When Matthew 1:21 declares the timeless truth that Jesus came to save His people from their sins, one has to remember it was by His own sacrifice that it was done. Hebrews 9:14 declares that the blood of Jesus would save people from their dead works to serve the living God. It was by this marvelous sacrifice and believing in who Jesus is and what He did, one can only say, "Why would God send His Son to die for a worthless worm like me? I only deserve Hell." It is that kind of mercy that leads from a life of sin to serving the Savior. It is that kind of mercy that leads any repentant lost sinner to result to a change in life. It is impossible that for a person who has trusted in Christ to still live like a devil and not to bear fruit because God's grace overcomes the sinner (Titus 2:11-14).
Jesus died so sin would be defeated on the cross and man be freed from sin not free to sin. There is really no such thing as a license to sin. In a true conversion, it creates that attitude of gratitude. Ephesians 2:8-10 says that we are saved by grace through faith and not by works yet it produces good works as a result of it. 1 Corinthians 6:9-11 describes how wretched, unrighteous sinners are changed by the grace of God. One cannot deny how the death of Christ has defeated sin and unbelief. The Gospel is never complete without the death, burial and resurrection (Acts 2, Romans 10). When the unrighteous man is redeemed it only makes them say, "Lord, you saved my soul... what will you have me do?" and not "Woohoo! I can now sin all I want." Only fake converts belittle the cross as a license to sin as the true converts do not want to live their old lives anymore.