Not only are the conviction rates horrible, and apparently the rate of cases even referred for prosecution being as bad, prosecutors get re-elected on winning records. With a Grand Jury, it is the prosecutor that must convince them that the case needs to go to trial... and we've all rehashed this entire sequence over and over already. A prosecutor that doesn't believe they have a strong enough case to win, especially in a high profile case, isn't going to be particularly motivated to push for a trial. Since a lot of these cases are "He said/She said", it's a safe bet that they'll never be tried. It's a sad reality, but it IS the reality of things. Without it being a rape where physical evidence would/could be collected, it's next to impossible to prove that something was or wasn't consensual, that some touching was or wasn't unwelcomed. It's an uphill battle for a victim and damn near a shield of immunity for the plaintiff.