Don’t just be horrified. Ban AR-15s, bump stocks and large magazines.

Even the best-written accounts cannot fully convey the carnage of mass shootings. The frequency and lethality of massacres on U.S. soil numb society to the moral outrage of slaughtered innocents. The Post this year has documented the carnage created by the AR-15 in a series about the growing prominence of the assault rifle in American life. The latest installment, published Thursday, includes gut-wrenching images from some of the 11 crime scenes they looked at over the past 11 years, alongside quotes from eyewitnesses and first responders.

Each photograph, while disturbing, is worth more...