I hope you aren't saying that victims of rape should be identified. It is difficult enough to get victims to come forward who have been raped or sexually assaulted, even when they do people won't believe them because of cases like you have stated. For every false accusation there are many suffering in silence.
I agree that the cases of false accusations are bad for everyone but lets not forget about the reasons for that annonymity. People who admit to bringing false charges should of course face charges themselves unless they are admitting it under duress (eg a forced retraction) This is a difficult issue and not as clear cut as you seem to make out.