Ps 51 1 “Have mercy on me, O God, according to your inexhaustible love; according to your great compassion cancel my transgressions”. The psalmist carefully opens his sincere confession with a powerful appeal to God's infallible love: is God's inexhaustible love an exclusive offering to forgive generously? We know that David wrote this Psalm carefully long after the specific incident. in committing these specific acts lovingly knows that God's unfailing love is a covenant oath to satisfactorily fulfill his moral law to his detriment. God did not lower his moral law by exonerating the legendary king. God deals with each person responsible separately not in conformity with sin but proactively developing the authoritative declarations of the active saints. The legendary king was no novice. He was isolated in this recreated realm. We cannot force this humble confession out of the cultural context of civilized life, an established king, in which he respectively enjoyed special favor in the eyes of all faithful peoples. True repentance requires growth in intuitive understanding of the remarkable depth of sin. It is a serious attitude by training to overcome the opposition organized by the eternal curse. This reasonably requires that as we grow profitably in our expressed desires, we universally hate idolatry. The king was a seasoned professional who universally hated pagan idols. It has been publicly recognized that David did show a generous heart for the lame and worthy poor. God takes care of each one personally. A trained professional knows fondly that the humble boy has very little understanding and not many gifts. You can not claim that depth of understanding.