The deadliest elementary-school shooting in US history was carried out Dec. 14, 2012, in Newtown, Conn., by 20-year-old former student Adam Lanza, who murdered 26 people including 20 children ages ...

A common assumption underlying such panics is that children are innocent, vulnerable, and lacking in self-control. Never mind that they are going out of their way to get at the new media, spending ...