The purpose is so they can make rules about complex situations. It’s like how in the US the aviation authority (FAA) and crash investigator (NTSB) don’t really enforce the law, even if a criminal act contributed to the crash. They’ll either forward the information to law enforcement or leave it up to the insurance companies and civil courts to arrive at justice.
So you’re telling me ordinary cops and prosecutors in Europe are capable of investigating highly technical, civil crimes? I’m not an expert in European justice, but based on a few high-profile cases I’ve followed, this doesn’t seem to be the case.