About 40 percent of defensive gun uses are connected with assaults in the home,69 and most presumably are cases of family violence.70 But the notion that much serious violence is accounted for by previously nonviolent people in "crime-of-passion" domestic homicides is wrong.71 For example, in a Kansas City study, in nine out of ten domestic "crime-of-passion" homicides, police had responded to disturbance calls at the same address within the preceding two years an average (median) of five times.72 Moreover, it's not clear what difference gun control laws would make. A large number of men who kill in these circumstances have a previous history of convictions and, as felons, are forbidden by current law to have a gun. One crime study concludes:73
It is commonly hypothesized that much criminal violence, especially homicide, occurs simply because the means of lethal violence (firearms) are readily at hand, and thus that much homicide would not occur were firearms generally less available. There is no persuasive evidence that supports this view.
"In most domestic homicides, there is a pattern of previous violence."