America has one of the absurdly strictest set of laws for sex offenses against minors, Economist had a great cover story about this some weeks ago. Problem is, since politicians know proposals for stricter laws bring in votes and no sane politician would ever propose a relaxation in these laws, they get stricter every year. On the other hand, the US has one of the most sexualized tweens and teen-agers I have ever see…
I think a good part of that is the fundamentalist Christian ('reborn') element in the United States which commands a fair portion of the vote.
There's a constant stream of fear mongering about paedophiles and terrorists in all mass media.