“So all the people and all Israel understood that day that it had not been the king's will to put to death Abner the son of Ner” (3:37). The fractured kingdom of Israel suffered as factions fought each other after Saul’s death. Men on both sides recognized the waste of lives, so when Abner offered a truce, David eagerly accepted (3:12). But Joab murdered Abner in a personal revenge-killing (v30), and then Ish-bosheth was murdered in his bed (ch 4).
Unstrained anger and hate, in ancient times, led to murder and destabilized entire kingdoms. “Blessed are the peacemakers,” Jesus said, because one person’s self-control can be the key to ending conflict.