What can people do with unsubstantiated accusations? Quite a lot, actually. If youre watching someone pushing one of your friends to have another round and getting handsy, would it be better to know if another person in your social circle said, that person raped me? Yeah, that would be important to know. And if two different people said it? And, given the silence around rape and the low reporting rates, one story is often an important catalyst for another. Once one story is out there, others tend to come up. The more data, the easier it is to compare, and evaluate credibility based on multiple data points. And what then? Then, accountability. That can look like a lot of different things. It can look like prosecution. It can look like some model of transformative justice, though I wont try to make a pitch for transformative justice models because I wont do it as well as its advocates would.* It might look like ostracization, because any social group, when someone harms its members, ought to be able to say, youre not welcome here anymore.
Some people will say thats rumormongering. Yes. Yes, it is. If stopping rape isnt a good enough reason to spread rumors to you, then you and I have nothing further to discuss.
Some people will say that its unfair to do that, to simply take the survivors word, to say things about people without due process. Well, due process is for the government, to limit their power to lock people up or take their property. You dont owe people due process when you decide whether to be friends with them. You dont have to have a hearing and invite them to bring a lawyer to decide whether to invite them to a party. And lets be honest, most of us repeat things that one person we know did to another person we know based on nothing more than that one participant told us and we believe them. We do it all the time, its part of social interaction.