That is not necessarily wrong but what is a fact is that Watchtower is not authorized to enforce secular law and it is also a fact that Watchtower does not have the power or authority to administer secular justice.
No one expects them to be so, There is zero problem with letting the WTS handle it's own pastoral and internal disciplinary processes any way they like within the law. They could make it so much easier if they simply told, even helped, anyone coming to them with a potential crime to go to the right authorities to get the secular, legal and criminal aspects handled properly. They can handle any internal matters themselves anyway they like then.
The problem, as has been repeated ad infinitum, is that there is an historical issue with reported incidents getting to the attention of the authorities and still a matter of debate if changes to policy really makes a material difference to this.
Nobody wants them to be policemen. They simply need to get the real ones involved as required and feck off back to their back rooms to run their little JCs.