I think it's fair to wonder why no criminal charges have been filed.
I think it is fair and understandable to wonder that.
My question is -- why is THAT the thing we've been focusing on here in this thread? Why is THAT the primary topic here, and not what Derrick Rose may have done, or why he did it, or why our justice system might make it easy for him to get away with it?
Why, in a thread about Derrick Rose being accused of rape, are we talking first and foremost about what the WOMAN in question did?
This is why, when I see people scoff at the notion that "rape culture" is real, I can only shake my head.
Because in our minds we have no evidence at all of what he did (and actually we have a strong denial) but we do have evidence of what she did (or I suppose didn't do). So rather than speculate on what we can't know we focus more on what we definitely know.
So, do you believe that 90%+ of people who identify as victims of rape or sexual assault are making it up?
Because there's no "evidence" of the kind you seem to require in the vast majority of cases, and the overwhelming majority of people who commit sexual violence never spend any time in a cell for it.
And how does that change unless victims go to the police as quickly as possible?
I do not understand what on earth you are insinuating be done about that.
Phosita has admirably tried to explain, but since you're not getting it, I'll try:
Many, probably most, women who are raped do not press charges, and certainly don't press charges immediately. Your argument is that women (and men, because men who are raped are even less likely to report than women) should do this. That's fine and all, but it's missing the point. And that point is that if it is common for this crime to not be reported, there is probably a reason, maybe multiple. And if society wants these crimes to be better punished, it's probably up to society to figure out why they aren't reported and prosecuted, and work on fixing that as much as possible.
Some of that starts with law enforcement. When women (or men) do report rape, they are often asked questions like:
1) What were you wearing?
2) Were you drinking/using drugs?
3) Are you dating this person?
4) Was this person paying you for sex?
And other such questions that can produce feelings of guilt and blame within the victim. And these questions aren't asked solely by law enforcement, either, but by society at large. By the time the victim has gone through enough self-examination and self-assurance to say, "Yes, I am the victim", it's generally too late to collect evidence. I mean, sometimes that can take years. And that's not even getting into the fact that many rape victims know their attacker and may have to be around him in their daily lives, and thus feel fear and intimidation keeping them from reporting as well.
Anyway, if you want victims to report quickly, you can help by changing your attitude towards victims. Saying "I am not likely to believe you if you don't report this to the police immediately" is a form of victim-blaming that is completely oblivious to the pain and trauma victims feel, and only reinforces the shame and embarrassment that helps keep them away from authorities.
Also, I don't remotely consider myself an expert on this, but knowing multiple rape victims, and knowing that none of them have reported it to the authorities, these are some of the reasons I've observed.