At the start of my military career I was an MP. Was first on the scene to a few rape cases. My observations are the same as yours, about 40%-50% of rape cases appear to be false accusations.
Now all our rape cases were investigated by CID and always had a female assigned to them. I was talking to the CID agent on one of the cases I was first on. She had been in the Corps for 12 years. She told me that from her experience about 50% of rape accusations were false.
Unfortunately, this sets it up for “cry wolf.”