There are very few emotions as destructive as anger. Shootings, murders, rapes, spouse and child abuse, intra-family squabbles (big and small), road rage, divorce, gang violence, are all fueled in part by anger. Anger is usually an aspect of any litigation, although even mediators must acknowledge that litigation as a dispute resolution mechanism is light years ahead of violence.
Anger and violence go back a long way. Whether we take the Bible as historical truth or a fundamental mythos of our collective Western unconscious, the first act of violence is primeval: it occurs between the very first human offspring. Most of us think we know the story, but just in case, the entire events are described in only seven short verses, as follows (Genesis, 4:3-9):