I don’t know, I don’t think I agree with a lot of those examples. There’s plenty of black artists who have gotten a pass on their behavior as well (James Brownm Miles Davis, Bob Marley), although that still fits in with the whole “we’ll give these people a pass because they’re a genius” thing. I think the reason why Chris Brown and Ike Turner shock us so much is that they beat people that we know. With most other abusive celebrities, you can overlook it a bit because you can’t often put a name or a face to the survivor, but you can to the abuser, so the survivor seems less important than the abuser. But when the survivor is Rihanna or Tina Turner, they are just as familiar to you as the man who beat them, so you can’t rationalize it away.