I just wanted to add here that one of the problems that takes place and one big reason Abusers often get believed over the victim is that the Abuser tends to act more rational.
Ofcourse the Abuser acts more rational because he/or she doesn't really FEEL GUILTY and is NOT THE TRUE VICTIM.

People NOTORIOUSLY fall for believing the Abuser because of how the Abuser can exhibit rational behaviors EVEN UNDER PRESSURE. People tend to think the Abuser is the better because "gee that individual can be so calm". Bill Cosby has shown this calm, in fact MANY guilty individuals have shown a calm and seemingly rational upstanding persona. People nortoriously fall for that which is why these individuals get away with so much, and many of these Abusers can be VERY CHARMING. No, they have two sides to them, like Sandusky, Cosby and so many others.