Death seems like a merciful result of corrupted nature. When Adam was in a state of grace, he experienced the Kingdom of God with his whole being, physical and spiritual. Both parts were corrupted by original sin, but God only allows the physical part to die, and before that happens we are allowed to let God in to our lives as fully as we wish to elevate our spiritual state with Him for eternity. So it’s not like God says, “You sinned, now you have to die.” so much as “You sinned, but only a temporary part of you has to suffer, and if you choose to you can use that suffering to draw the eternal part of you to heavenly bliss.”