Here are some interesting numbers.
"With an average of 13,657 homicides per year during the 2007-2017 time frame, about one-tenth of one percent of homicides were produced by mass shootings involving AR-15s. According to a New York Times analysis, since 2007, at least “173 people have been killed in mass shootings in the United States involving AR-15s.”Jan 11, 2019
From the CDC
"Between 2007 and 2017, nearly 1,700 people were murdered with a knife or sharp object per year. That’s almost four times the number of people murdered by an assailant with any sort of rifle."
Sounds like those "sharp objects" are far more dangerous than an A R.