I blame the media for creating a mood of hysteria. The "well-informed" parent is expected to see threats in each and every person that walks by. A few well-publicized cases of creeps and nutjobs stalking children is now seen as the norm, and ordinary people are suspected and accused.
Of course, those shows that set up sting operations for predators don't help. If you watch any of those, you will think that ALL men are out to rape and exploit your children. How can you help it? Read the newspaper...every day there is an article about an attempted abduction, or a selectman caught with child porn, or a priest raping an altar boy.
Is the media at fault? Or is society?