When children get lost in a mall, they're supposed to find a "low-risk adult" to help them. Guidelines issued by police departments and child-safety groups often encourage them to look for "a pregnant woman," "a mother pushing a stroller" or "a grandmother." The implied message: Men, even dads pushing strollers, are "high-risk." Are we teaching children that men are out to hurt them? The answer, on many fronts, is yes. Child advocate John Walsh advises parents to never hire a male babysitter. Airlines are placing unaccompanied minors with female passengers rather than male passengers. Soccer leagues are telling male coaches...