But you were comparing one imperfect system with another imperfect system. Our laws have checks that hold people responsible. From the laws itself, to the defense attorneys, judges, lawmakers, elected officials, and police. There is no accountability in private channels on the internet. It's horrible how the justice system is failing rape victims, but to make more victims is irresponsible imo.
Maybe the media has been focusing on false accusations and how imperfect the justice system is, since I don't know any statistics offhand, but currently I feel the justice system is weighted heavily against the accused. The state is very powerful and depriving a person of a normal life through prisons and past convictions is a very scary thing. From what I've read and understand of the law, which is admittedly pathetic, I side with the idea that it is better to let a guilty person free then sending an innocent person to jail. So far I haven't been convinced otherwise, but I would be open to the opposite.
It isn't only rape criminals that are let free. There are murderers walking around that the justice system has failed to prosecute, jail, and rehabilitate. I've been a victim of property crimes several times which amounts to almost nothing compared to rape and murder, but I'm fairly sure the criminals haven't been caught and it is considered low-priority. I have received no justice should I look into vigilantism and seek justice on my own with no one to hold me accountable? What about family members who have lost someone to murder and the person they thought that did it was declared not guilty, what should they do? Where is the line between mob justice and a society of laws?
I really don't know what the rape victim in the op should do. If she wants to warns others of a serial rapist, she could go public and accuse him, but that has its own drawbacks. If she wants to warn her friends and social circle, which is an argument that has been used, I think that would be great. The problem with using the internet is anonymity and who knows who the accuser is and who knows who the audience is and how they will react. In a social circle you know the accuser, the accused, and person being told is known to the accuser, but even through all those conditions are met that still has drawbacks. So I really don't know. The justice system will always be imperfect. The only thing we can do is try to improve it through laws, elections, and education.
I hope what I wrote makes sense. Just so we're clear I'm not completely anti-vigilantism. Some of what I've typed is simply debate and doesn't necessarily reflect my views.
To be honest nothing meaningful other than voting. I haven't done anything meaningful combating false rape allegations either. There are a lot of issues I haven't done anything about. It's kind of embarrassing, but also overwhelming.