I seem to be promoting a book by Malcom Gladwell, "Talking with Strangers" this morning on GN but it might explain why rape cases are not pursued as vigorously as we would like. I promise I am not affiliated with the author in any way but it does offer some illuminating insights. Chapter 8 discusses the case of Brock Turner who raped a girl at a Frat Party. Gladwell explores the role of alcohol and blackouts which happened to both parties in the case. Having watched teenagers in action, I have seen this "blackout phase" with my own eyes and it is quite frightening how easily young girls, in particular, get into that state. The fact is, if boys are in a similar state, they are both incapable of making those decisions about consent. We willingly accept that females can't consent when in that state but we don't accept that boys are equally incapable. If we look at the statistics regarding alcohol consumption, we can see that it has escalated enormously, particularly with females whose blackout point is much lower, so it is not rocket science to see that they might find themselves in a "rape" situation far more often than they used to. This will also make it far more difficult to get a conviction.
However, having experienced the CPS within the family in 2 cases, everything is pitifully slow and stressful for the victims. It does seem incredibly biased towards the alleged offender. One of the cases is regarding a very serious offence where the offender has admitted guilt in a statement. It has still taken over 6 months to get the green light to go.