Parent's want their kids to be safe from predators...but that's NOT what they REALLY fear.
Protecting kids from getting molested is easy as pie. Just teach them what to do in that situation. If some guy touches them in a uncomfortable way, tell them to say "NO!" and threaten to scream or run away--they'll get the message. It's SOOO easy. We teach kids to walk, talk, read, write; teaching them to avoid bad men is a cakewalk.
But almost all parents don't choose that option. Instead they watch their kids' every move, they don't let them play alone, or go trick-or-treating alone, or go on the internet without a million filters, and software that tracks every click.
Why do parents stress themselves out with this ineffective method? It's because their REAL fear is not a child molester. The real fear is that their kid might WILLINGLY engage in some type of sexual activity because they WANT to. That is terrifying for a parent, because A. that's something they can't control and B. it fucks with their diseased worldview that kids are pure, innocent and a-sexual, and that adults are sexual and corrupted.
My mom removed the door to the TV room when I was little. I asked her why years later, and she said because she didn't want me and my friends playing sex games. She didn't want us having fun. But we did anyway--in secret so we wouldn't get in trouble.
We all played those games as kids, with girls and boys. And every once in a while, a kid might wanna play a game with an adult. THAT is the real fear that no parent wants to admit. They're fine with the thought of their kid being a "victim", but being an actual participant is too much to bear.