Because in the story God is telling, evil does not have the last word. Good Friday is not the end (which is why it’s so good). He burst from the spiced tomb on Resurrection Sunday, commissioned his disciples, and ascended to his throne, where now he sits until all of his enemies are subdued under his feet, including and especially Evil.
This then is the truth, goodness, and beauty of the Christian answer to the problem(s) of evil. It is the confession of Jesus Christ, the Divine Author who never himself does evil, but instead conquers all evil by enduring the greatest evil, and thereby delivers all those enslaved and oppressed by evil who put their hope in him.
O Come, O Come Immanuel.
Joe Rigney, Confronting the Problem(s) of Evil
Joe also gave one of the most helpful sermons on prayer and God’s sovereignty I have ever heard: If God Knows Everything and Planned Everything, Why Pray?