Because Jesus was chosen by God to be killed and take away the sins of the people so that they would be forever forgiven if they believed in Christ and asked for forgiveness.
For them the death of Jesus was part of a divine plan to save humanity. The death and resurrection of this one man is at the very heart of the Christian faith. For Christians it is through Jesus's death that people's broken relationship with God is restored. This is known as the Atonement.
All people who want to drive have to be shown responsible for what they do while driving, they need to proven to be careful and drive safely... what answers are you looking for?