Tough on sin and tough on the causes of sin

Why, asks J I Packer in his breath-taking chapter, 'The Heart of the Gospel', does Jesus fear death when Christians have died peacefully and without fear? It can't have been the physical pain of the cross that made the difference because Christians have faced equally painful deaths and faced them with courage, not fear. The difference is that Jesus died under the wrath of God and the Christians died free from the wrath of God.
'On the cross, God judged our sins in the person of his Son, and Jesus endured the retributive come-back of our wrong-doing. Look at the cross, therefore, and you see what form God's judicial reaction to human sin will finally take. What form is that? In a word, withdrawal and deprivation of good. On the cross Jesus lost all the good that he had before: all sense of his Father's presence and love, all sense of physical, mental and spiritual well-being, all enjoyment of God and of created things, all ease and solace of friendship, were taken from him, and in their place was nothing but loneliness, pain, a killing sense of human malice and callousness, and a horror of great spiritual darkness.' (Knowing God, pp219f).

All of this explains my own morning Bible reading; Matthew 18:1-10. Here, Jesus gives the sternest possible warnings about sin and those who cause it. The eternal consequences of sin (whether I commit it myself or cause others to do so) are horrific - exactly what Jesus underwent on the cross - and must be avoided at all costs. The cost of a hand or an eye is a price worth paying to avoid the eternal fire.
But sin is not so much this or that naughty thing that I do (or cause others to do) but a refusal to come to Jesus in childlike humility, accepting that he died for my sin. 'Jesus said, 'I tell you the truth, unless you change and become like a little children, you will never enter the kingdom of heaven.' The disciples wanted greatness, honour, status. The child was happy just being a child, coming to Jesus when invited.
Which am I? Which are you?