Separate incidents in entertainment news last week highlighted just how deeply blacks are in thrall to the divisive racism of identity politics. First, ESPN commentator Rob Parker raised viewers’ eyebrows with his astounding musings about Washington Redskins quarterback Robert Griffin III on the show First Take. Parker, who is black, openly questioned whether the black “RG3” is black enough: Is he a ‘brother,’ or is he a ‘cornball brother’? He’s not really… he’s black, he kinda does his thing, but he’s not really down with the cause. He’s not one of us. He’s kinda black, but he’s not really, like,...