As I said before, the kids learned something. One problem with pedophiles is that they convince children that they can't do anything, that their parents will be mad at them if they find out, etc. These kids learned differently. They learned that there are things strange adults aren't allowed to do to them, and that other adults will help them.
Also, sex and the use of force are both things that are quite appropriate in the right context. Outside that context, they can be very destructive. One quarell I have with c_yeager's thinking on this, is that he ignores the context of both things in the story. Whatever one thinks of porn, this was the wrong context for any sexual messages of any kind - young children, an adult stranger of questionable motives. Whether the beating administered, which doesn't appear to have been that severe, was perfectly legal or was precisely the right thing to do, it was in a far more appropriate context - stopping a potential childing molester.
