I worked for the CPS for the first ten years of this millennium. In my role, every case committed or sent to Crown Court in the area came to me to allocate to a lawyer and caseworker, as did every pre-charge advice case (the files where someone has been arrested and bailed while the strength of the evidence is considered) involving rape or sexual abuse.
In those ten years, two women were prosecuted for making a false allegation of rape. Two. What happened to the two men involved was horrendous and I have huge sympathy for them. However I have equally huge sympathy for the literally hundreds of women whose cases were discontinued or did not even get as far as a court, not because the prosecutor didn't believe there was some credibility behind the claim but because they couldn't say there was a reasonable prospect of conviction, which is the evidential test all cases have to pass before they can be prosecuted. I saw sexual abuse and rape cases discontinued (pre- and post-charge at a rate probably higher than two every week. I lost count of the number of times I heard the specialist sexual offences lawyers on the phone to the investigating officer saying "I'm sorry, she almost certainly is telling the truth but a jury won't convict on this evidence so I'm having to discontinue it."
I was the caseworker in a child abuse case once. The evidence was compelling - medical evidence, opportunity, defendant with previous convictions with a very similar MO. The child was five :( Unfortunately, on the day of trial, even with her statement given in the form of a video and her in a separate room away from her abuser connected via video link, she clammed up completely when it came to cross-examination. It is a basic tenet of our adversarial court system that a defendant must be able to cross-examine the witnesses called against him, and as she refused to make a sound due to being overawed, shy, whatever, the case had to be discontinued and a formal verdict of NG entered.
So you can flame me and condemn me as much as you like, but my professional experience is that in the case of an acquittal or discontinuance in a rape or sexual assault case, the odds are vastly more indicative of the defendant/accused having been involved in some way than they are that the victim is making it up.