Biblically, God communicated to humanity that ultimate death is just for sinners (the sinless won’t stay dead).
See full article to analyze 5 arguments:
This is relevant because the Bible is reliable on this point.
Philosophically, God’s big aim in creation is (plausibly) to promote His own self-image and increase God-resemblance in the world.
This is relevant because a world in which only those who choose to sin die helps maximize God-resemblance in the world. (sinning decreases the world’s God-resemblance). This limits their influence by limiting their life-span and power. Simultaneously, something that would help to maximize God-resemblance in a world is God’s making things such that the world yields and then eternally preserves free empowered heavenly agents who eternally choose to do good and be sinless (i.e. choosing in ways that God would choose). [Note: directly creating an agent who is freely sinless for eternity without help is a square-circle; see “Why didn't God just create us perfect in heaven?” for a fuller explanation of how God acquires such agents.]