"But he was pierced for our transgressions; he was crushed for our iniquities; upon him was the chastisement that brought us peace, and with his wounds we are healed. All we like sheep have gone astray; we have turned—every one—to his own way; and the Lord has laid on him the iniquity of us all." - Isaiah 53:5-6, ESV
In Sid Fleischman's classic Newberry Award-winning novel, The Whipping Boy, Prince Horace is a spoiled brat who nevertheless cannot be physically punished for his numerous wrongs. Instead, Horace is given Jemmy, a "whipping boy," who is beaten every time Horace misbehaves. Readers feel the tension as Jemmy is beaten for Horace's crimes and feel a sense of justice when Horace is finally beaten when Jemmy is mistaken for the prince.
It is unfair that Jemmy should be punished for Horace's crimes. Many people have made the same "unfair" objection to the Christian Gospel.