Some rape survivors (and organizations that address sexual assault and rape) advocate and advise reporting to police and the legal system. Doing so is usually an overall bad experience but it is typically considered necessary. Even if it is often ineffective for some individuals it can be effective in bringing attention to the issue and giving a larger voice.
Examples:
https://rainn.org/get-information/le...reporting-rape
There are far more accounts of why people do not report rapes to the police but it isn't the case that all rape victims would advise other rape victims to not report rape to the police.