As children we are taught don't talk to strangers, but sometimes the worse threat is those you know. In my Social Problems class, we discussed an article about Halloween Sadism in which a long time ago people were afraid that their children's candy was being poisoned when they went out tricker-treating, especially when two deaths were reported, but what most of those reports left out was that those deaths were the cause of family members, but we still don't want our kids talking to strangers. It seems these days that it's hard to trust anyone. I know, it's just a movie, and yes, it's based off a book, however, these kinds of things still happen, and there's no stopping it, because there are sickos out there. I'll never be able to understand how someone can do something like this especially to kids. I suppose, this is an pessimistic look, but we should really be aware of our surroundings, which include people you know. If we can't trust our family and close friends, then who can we trust?
PS On a different note, you should go check out "Dear John" it's one of the most amazing movies I've seen in a long time.