If you were sentient in the early 1980s, you probably remember watching public service announcements that made it seem as if every neighborhood in America was teeming with creeps. A typical “stranger danger” P.S.A. went something like this one, from the American Medical Association. A maternal voice-over intones: “You’ve taught your children to be polite and friendly. But have you taught them when not to be?” Then, a central-casting child predator rolls up in a sleazy sedan and tries to kidnap a little girl on her way to school.
The announcement claims that in the previous year, 50,000 children disappeared, but that figure is wildly misleading: Nearly all of those missing children were runaways, not kidnapped by strangers. A few cases of child abduction and murder — Etan Patz in 1979 and Adam Walsh in 1981 — put the country on edge, and these ads were meant to help raise awareness so no other children would meet the same hideous fate.