It was a costly triumph. But God’s values are not so easily reckoned. If God had simply terminated Satan, then it would not have been so clear that God is both stronger and infinitely more to be desired than Satan. God wills for his glory to shine forth not only through acts of physical power, but also through acts of moral and spiritual power that display the beauty of his grace with lavish colors. To take sinners out of Satan’s hands by virtue of Christ’s sin-bearing sacrifice and his law-fulfilling obedience to the Father was a more glorious victory than mere annihilation of the enemy.
~ John Piper