Corey G. Johnson, ProPublica

From the movie theater to the shopping mall, inside a church and a synagogue, through the grocery aisle and into the classroom, gun violence has invaded every corner of American life. It is a social epidemic no vaccine can stem, a crisis with no apparent end. Visual evidence of the carnage spills with numbing frequency onto TV shows and floods the internet. Each new shooting brings the lists of loved ones lost, the galleries of their smiling photos and the videos of the police response. And each mass shooting brings another surge of national outrage.

According to the Centers for Disease Control and Prevention, guns became the leading killer of children in 2020, overtaking car crashes, drug overdoses and disease for the first time in the nation’s history. Yet as the one-year anniversary of the massacre at an elementary school in Uvalde, Texas, passes, nagging questions loom....