So by your numbers, there's a greater than fifty percent conviction rate once the thing actually goes to trial. And I see no reason this case can't go to trial, as the accuser has already taken the most difficult step of going public. The hardest part is just getting to the point of public accusation and trial. If the evidence is compelling as everyone here is saying, then there should be no problem convicting him.
Do some rapists go free? Yes. But even beyond sexism, that's simply a function of the foundations of our justice system. Most rape occurs in a setting where it's one person's word against the other. Hell, what starts as a private consensual act can turn into rape. (Not what's being alleged in this case.)
Have you forgotten the basic foundations of our justice system? Did you receive that poor of a civics education? Have you forgotten, "it's better for ten guilty men to go free than for one to be wrongfully punished?"
Well I actually believe that. I don't want to see anyone guilty go free. But I also don't want to see our country become a place where people can easily be falsely convicted of crimes based on little evidence. (And people still end up falsely convicted.) I want to see rape convictions be as successful as possible. But if you actually care about human rights and justice, you have to acknowledge that the conviction rate for rape is always going to be lower than other crimes. It's just the nature of the crime itself.