A 16-year-old walked into his former elementary school in Bend, Oregon, with a shotgun his mother bought and killed three children and a teacher before an armed parent stopped him — another massacre where every adult in the chain failed to act.

The weapon was a Maverick 88 12-gauge pump-action shotgun, purchased by the shooter's mother, Shauntai Nickerson, around the time of his August birthday, law enforcement sources told the New York Post. She knew her son was a special-needs student who struggled profoundly — she said so on television in 2020, telling a local station she was "not certified teaching a special-needs student" and that remote learning during the pandemic was devastating for him. She bought a shotgun anyway. Now four people are dead, and the usual chorus will blame the gun, not the person who put it in a troubled teenager's reach.

The shooter, identified as Griffin J. John II, was a former special-needs student at Silver Rail Elementary. He threw the shotgun over the school fence, climbed over, and blasted his way through a set of double doors, firing rounds into the glass to force entry, according to Bend Police Chief Mike Krantz. He went straight for his old special-needs classroom and opened fire. The children killed were ages 5, 8, and 11. A 25-year-old teacher, Megan Lambert, was also killed.

The system had every reason to watch this kid. Investigators are now combing through his computer, phone, social media, and search history, probing whether he was obsessed with prior mass shootings, CBS News reported. That profile — isolated, special-needs, documented struggles, apparent fixation on violence — is the same signature the public has seen before. And once again, nobody intervened before the bodies piled up.

An armed parent ended the rampage. Kaylub Giamanco, 36, whose children attend the school, witnessed the initial confrontation, grabbed his legally owned .40-caliber pistol, entered the school, and shot the killer multiple times, Krantz said. A teacher also threw her cellphone at the shooter and tackled him before Giamanco fired. The chief praised both as "heroic."

The outlets diverge on the sequence of the initial confrontation. CBS News reported the shooter first fired on a passing pickup truck, whose driver called 911, before Giamanco entered the fray. The New York Post framed it differently, claiming Giamanco shot at the shooter at the front door first, forcing him to go around back — and that the shooter then "blew off" a lock designed to prevent such breaches. CBS made no mention of a defeated lock, only that the shooter fired through glass panes.

Nickerson was seen on her porch Friday, smoking a cigarette and crying. "I'm sorry... I miss him," she said, according to the Post. "A good boy, he really was." She added: "If I could have prevented this, I would have." She did not address why she purchased the shotgun.

That question — what did she know, and why did she arm him — is where accountability lives. The gun didn't walk itself over that fence. A mother bought it for a son she knew was struggling. A school system had him in its care. Whatever was on that computer and in those search histories was accessible to someone before Thursday. The firearm is the tool. The failures are the story.