So, God , not the person makes the decision? God chooses to "leave them to themselves" in sin?
The issue I have with your line of questioning is that it seems to make God look unfair; that God is capricious and mean because God does not save all. We need to understand that one of God's attributes is holiness. God cannot abide sin. Sin cannot enter into His presence. If God is fair than He either needs to save all or save none. That He chooses to save some is an act of mercy and grace. Shall we criticize God for this (Romans 9:21)?