I like to think all the laws and condemnations of the Bible are there to make us realise what undeserving sinners we are, so that when we find we are saved by Gods grace, we Love him for his mercy.
Surely the only thing God cannot create or force is our Love for him, it can only be earned by his actions towards us.
Without the knowledge of how unworthy we are and deserving of death, we would be just like the JWs who are so perfect and do so much field service that God owes them everlasting life, they are going to miss out on gratitude if they feel they have nothing to be gratefull for.
Jesus said the miserable sinner was more righteous than those who felt they where allready righteous enough.