What this shows is that encryption does not lock justice out and that it's really no different than papers in a safe in a person's house. If prosecutors have a valid reason to access the information they can go to a judge, get a lawful court order and serve it against the person who owns the safe.
Encryption backdoors aren't about justice. They're about the government's ability to conduct fishing expeditions: to surveil massive numbers of citizens without their knowledge and without their right to a day in court.