A couple of thoughts...
Accusations (that we know of) against BC date back to 1965.
http://www.etonline.com/news/154160_timeline_of_bill_cosby_sexual_assault_allegations/
Let's look at the mind set back then. Women had only been assured of keeping a job if she were pregnant in '78. Borrowing money '74 (Equal Credit Opportunity Act). Marital rape was not outlawed in all 50 states till 1993. Sexual harassment wasn't defined by the EEOC until 1980. And many women faced push back when she tried to exercise those rights. At home and at work. Myself included. Quite simply, women were accustomed to asking (men) for permission. Generally speaking.
Rape hot lines didn't exist till the 70's and were only available in bigger cities. The same with women's shelters. Survivor blaming was the norm. Maybe it was rape if the women was beaten and showed signs of fighting back, even after they were were told not to. Women were routinely denied welfare benefits after leaving an abusive partner because of his income. DNA testing didn't exist. Nor did testing victims for drugs.
Police were not educated in how to handle complaints of rape or sexual assault and were often brutal in questioning.
The term date rape didn't come about till 1980.
The statutes of limitations were different then. Strides have been made.
Current statutes:
http://victimsofcrime.org/docs/DNA ...sault-check-chart---final---copy.pdf?sfvrsn=2
It also matters if is was a rape or sexual assault.
By their nature rape and sexual assault are generally crimes without witnesses. It is only the kids today with cell phones that are idiotic enough to record their crimes.
Today, if a woman is raped, taken seriously, goes through rape kit testing, by specially trained personnel, there is a good chance that her kit will languish unprocessed (est. 400,000). Out of 100 rapes, 32 will get reported to police, 7 will lead to an arrest, 3 are refereed to prosecutors, and 2 will be convicted and serve time.
So you meet a rich and powerful man. He offers to mentor you and your career. He is an American hero. You agree to meet. He offers you a beverage. Or something for you headache. Very bad things happen. What is your first reaction? Do you even remember what happened beyond that sickening feeling in your gut? If you do remember? Get safe, denial, shame? Do you repress it? What would you do? In 1965?
We cannot judge the past by today's mindset and legal options. Most of those options didn't exist when BC started raping.
I am not surprised that the women who couldn't would stand up for themselves are standing up for the women now coming forward.
Rape takes away your feeling of worthiness. They may not have felt worthy enough to stand up for themselves, but see the worthiness in others.