You are right. That is why cases are referred to as the Queen vs John Doe. Otherwise we would have the Hatfields and McCoys. Blood feud does still exist in many parts of the world however where the rule of law is mostly a fiction. But for our system  to work as it has for hundred of years victims must trust that justice will be done and seen to be done.
Many years ago we were the victims of a crime, ie a theft of over $5000 by a hired temporary caregiver. When the theft was discovered police were duly called and arrived to take a statement including the name of the perpetrator. And that was it. Never heard from them again. Not quite justice. The system certainly did not nurture any victim interest in criminal proceedings. Of course I don't know if there were any criminal proceedings. Not being wrongheaded we didn't pursue the matter.