Gun violence has exploded across the U.S. in recent years — from mass shootings at concerts and supermarkets to school fights settled with a bullet after the last bell. Nearly every day of 2024 so far has brought more violence. On Feb. 14, gunfire broke out at the Super Bowl parade in Kansas City, killing one woman and injuring 22 others. Most events draw little attention — while the injuries and toll pile up. Gun violence is among America’s most deadly and costly public health crises. But unlike other big killers — diseases like cancer and HIV or dangers like automobile crashes and cigarettes…