This guy is really showing himself to be the angry racist that we all knew he was, and as you say, he’s digging, digging . . . .
Obama can’t let it go because he is the president (as he has reminded of this right out loud at least three times) and cannot let some mere policeman get in the last word or get the better of him
Obama is compulsive on this. I’m sure his advisers told him to let it go