Why in the world would anyone think amnesty is a good idea?

People are provoked into commiting crimes because of their circumstances. A baby born in this World is a lump of clay which gets molded by people around it, who are the cause of circumstances which the baby faces. There are stages through which an individual passes before commiting crimes. Firstly it is his mind(which determines the right things for an individual based on what is good for society and his position in the society) which alerts him of his actions, secondly it is his immediate family which alerts him of his actions and finally comes the society which cautions and punishes him. At the third stage comes this question of amnesty, having been warned of one's actions if one has still persisted on commiting crimes one has to be voluntary in dismissing one's chances for amnesty. But if like most individuals in society if some are not provided chances for undergoing these stages which restrain individuals from harming society then they should be considered for amnesty with suitable steps to alert them in case of any transgressions in future.