Moreover, the scale of preparedness efforts is out of proportion to the risk. Deaths from shootings on school grounds remain extremely rare compared with those resulting from accidental injury, which is the leading cause of death for children and teenagers. In 2016, there were 787 accidental deaths (a category that includes fatalities due to drowning, fires, falls, and car crashes) among American children ages 5 to 9—a small number, considering that there are more than 20 million children in this group. Cancer was the next-most-common cause of death, followed by congenital anomalies. Homicide of all types came in fourth. To give these numbers yet more context: The Washington Post has identified fewer than 150 people (children and adults) who have been shot to death in America’s schools since the 1999 shooting at Columbine High School, in Colorado. Not 150 people a year, but 150 in nearly two decades.

Preparing our children for profoundly unlikely events would be one thing if that preparation had no downside. But in this case, our efforts may exact a high price. Time and resources spent on drills and structural upgrades to school facilities could otherwise be devoted to, say, a better science program or hiring more experienced teachers. Much more worrying: School-preparedness culture itself may be instilling in millions of children a distorted and foreboding view of their future. It’s also encouraging adults to view children as associates in a shared mission to reduce gun violence, a problem whose real solutions, in fact, lie at some remove from the schoolyard.