The point is that the Internet allows us to search for freakishly unlikely events. The only valid way to decide whether those events are acceptable is by comparing them to events we have already decided ARE acceptable. We have decided that it's acceptable for a few dozen American adolescents to be raped each week. Increasing that rate by at most a few percent is not a cause for panic, nor a reason to put them all under communications house arrest.

"... otherwise wouldn't have had access to."

If they are spending their energy on Internet meetings, it is certain that they will have less energy to spend on in-person acquaintenances. There is probably a very strong substitution going on. The teenager who is open to the molester next door is certainly even more open to the exciting mysterious molester from the next town.