It is criminal violence, not gun violence. Do you refer to traffic deaths as auto violence? Airplane crash as airplane violence? Accidental death from sleeping pill overdose as pill violence? The list goes on but you can probably follow along with the theme. There are three guns within two steps of my desk right now. Even a scary black semiautomatic.223 with an 18 inch barrel, scope, and foregrip with a pop out bipod - which you probably call an assault rifle. None of those guns have ever harmed a soul or been violent, even the scary black one. In fact, those lazy guns are about as far from violence as you can get. They just sort of hang out all day doing absolutely nothing. Hell, I don’t think they have even moved in more than two months.
They never say anything about knife violence in knife attacks either. You are right, it’s criminal violence.