Maybe, the translators didn't have it right. The letters of Paul predate the Gospels. 
The authors Mark and Mathew were relying on sources that did not know exactly the words of Jesus as handed down decades later (40-60 years).
Based on Jesus' teaching everyone was included except the Pharisees who separated themselves from others. Jesus considered that sinful. Maybe the "many" excluded the Pharisees?
The Pharisees were the ones who were doctrinaire and plotted against Jesus. Jesus was compassionate as God was compassionate. We are forgiven as we forgive others.