rape is one of the hardest, if not the hardest crime to properly support by evidence. even small property crime is more provable than rape.
thats because rape is mostly reported too long after the act, so no DNA or bruises or other evidence with short lifespan can be collected. only rapes with other witnesses or recordings or some other evidence can be properly prosecuted.
its a shit world we live in, if you commit rape, you are extremely likely to get off scot free.