I don't think this is it. It's a matter of resources. Police and courts are already so overburdened that it's hard to get enforcement on anything that isn't practically life or death. Have you or a friend ever had your apartment burglarized or a vehicle stolen? The police will show up, usually after several hours, take a statement, after which you'll never hear from them again. In fact I don't know a single person in real life who was a victim of a burglary or auto theft where the perpetrator was caught, save for those cases like a car jacking where significant violence was involved.
When the police and district attorney in any given city in the U.S. are looking at double-digit unsolved homicides and God knows how many unsolved rape cases, I don't think they're going to put a high priority on the fact that there's a naughty movie out there that someone willing filmed themselves in and is now regretful about. This does not mean folks don't believe these things matter, because they do. It's that relative to what the justice system is already dealing with, these things are much less important.