Sociopaths like OJ never get there. Your compassion is misplaced/wasted.
Theodore Bundy was not out of God's reach. But he needed to be executed for his crimes.
Want to talk sociopath? O.J. doesn't have anything on Nebuchadnezzar (Daniel). How about the King of Assyria? (Jonah 3) No one, not even Stalin, Hitler, and Pol Pot combined could reach that level of depravity.
God gives grace to who He chooses, in the framework of a "whosoever" Gospel (John 3:16, John 17).