According to a study, children that have been exposed to family violence show much of the same brain activity as soldiers that have been in combat.
In 1989 a Los Angeles woman received a phone call from her brother-in-law saying that her ex-husband was coming over to kill her. She dialed 911 but was told nothing could be done unless he showed up at the house. Within 15 minutes he arrived, killing her and 4 others
The founder of the first Women’s Refuge determined that much domestic violence was reciprocal, with both partners abusing each other in roughly equal rates. After which, her family received death threats from militant feminists, had her dog shot, and fled to North America.