The person has already reverted to Satan's ways and has destroyed his relationship with God. The action is taken to make him aware that his ungodliness has already destroyed his relationship with God's family. He is enduring the consequences of his actions to move him to repent and restore his spiritual estate. This is done as an expression of love in the concern of love. We need to make these observations about Christian discipline.
Christian discipline is an act of love just as certainly as parental discipline is an act of love.
If there is no love, it is not discipline. Christian discipline is not intended to be an opportunity for us to vent our anger or contempt. Never is the purpose of Christian discipline to run a brother or sister off. The reason Christian discipline is so ineffective in the church today is found in the fact there is too little bond and relationship of love. The wayward brother or sister feels no loss.