As to the culture of fear, I blame local news. It's wall-to-wall with alternating RAPISTS EVERYWHERE and LOOKIT THE CUTE PUPPIES, because those are the only stories that can compete with other news media. Telling people that they should be terrified (your neighbor is probably a child molester! Full story at 10!) is an extremely powerful tool, and people eat it up.
As a parent, I can understand those moms' reactions, even if I don't condone them. My kids are the most precious thing in the world to me, and I would rather err on the side of caution than ever let something truly traumatic happen to them. But, I think there's a line between being vigilant and being paralyzed in fear because someone with a penis is within 200 yards of your kid.