But you are forgetting about Sin entering the world. Sin (and Satan) is who should be blamed for cancer, sickness, pain, abuse, suffering and so on.  Sin is like the world's worst computer bug.  The only way to fix this "bug" is to ask the extreme "programmer" for the fix.  He offers a "fix" but it requires us to accept His fix for it, which is accepting that we cannot fix the bug ourselves and we need Him (Jesus) to come and do it for us.

Although God does care about our physical health and well being, He is ultimately much more concerned about our Spiritual well being.  God is eternal.  Our lives are going to end on this earth.  Death was a product of man's choice in the garden of Eden.  It pained Him that we made (and still make) the choices we do.  It is like we keep downloading software with bugs all the time.  God is willing to clean up our computer for us if we ask Him too but it would be better if we worked hard at keeping our software free of those "bugs."  I pray that God will help me live a sinful life.  I don't want to grieve Him, out of love for Him.  Once we truly understand the nature of God our attitude towards Him changes and in response we want to do everything we can to please Him and keep our lives, with His help, as "bug" free as possible.