When the people willfully sinned against God, prophets were inspired to go among them and preach. Of all the religious topics they could have chosen to preach, these prophets preached of the upcoming atonement (death and resurrection) of Jesus Christ. This preaching must have had pretty good effect, for certain judges secretly – and illegally – had these prophets put to death.
The doctrine of the atonement is the biggest gun a Christian has! We should focus on it more as we combat the evils in our lives.