From the conversations I've had with frum professionals in this field, there is a lot being done, including reporting to the police. However, just because all of us armchair quarterbacks (mixed metaphor acknowledged) aren't aware of it doesn't make it untrue. It would seem the reason much if what is being done is not well known is because often the publicity is counter-productive, causes unnecessary chillul Hashem, and ruins lives based on suspicions. So it is dealt with in a more tznua (quiet) fashion which often gets more efficient results. Unless you live under a rock, I would think parents are at least aware of this issue.
And I believe that the majority of molestation are by family members (uncles, step-family, cousins) not in camps or schools