Justice is an interesting theme in the later part of the story of David. As David got older, he seemingly started to lose his competency of imposing justice on his people. He's the second King of Israel, before him and Saul there were numerous "Judges". Kings were supposed to be with greater power than the Judges when perpetuating justice. But the aged David were no longer adroit as a King, nor would he be more competent than the previous Judges when judging people. In the cases of Absalom, of Amnon and of Mephibosheth, he all miserably failed. On the contrary, Absalom cared for and revenged Tamar, and tried to judge in his father's place when he started to behave dissolutely.