I've never understood how these abusers get away with it. If I had physically abused my ex, I'm sure her dad, uncle, brothers, you name it, would've come to her rescue and tried to beat me up...or worse.
Right. And then what happens when uncles and brothers are gone, and victim is left alone with the abuser? Unless you get the victim out of the situation, attempts to intervene can just make things worse.
With child abuse, you have a depressingly long list of cases where the child victim simply is not believed, or where the adults involved close ranks around the abuser rather than the child.