I see you believe in the printed word...good.
Then maybe you'll believe the printed words in the Koran promote retribution for transgressions and the printed words in the New Testament promote forgiveness for transgressions.
The Qura'n says: "If anyone transgresses against you requite him with an exactly like action and restrain yourself for Allah; and know that Allah is with those who so restrain themselves" (Surah 2:194).