OK, I have a slightly different take, especially after listening to Roy Ennis and another black spokesman talking the other night. I believe they were both in agreement that Dog is not a racist. It was pointed out that he has a black minister, and many black friends, and that his use of the N word was more of an over-familiarity that comes from hanging with so many blacks that treat him like a "brother."
Apparently the issue with Tucker & girlfriend is that Tucker is a "black sheep" within the Chapman clan, having served prison time and being a generally "bad boy." Tucker has not been allowed to participate in the family business, and he wants a piece of it. So he has a black girlfriend that has heard Dog say the N word and has threatened to sell the info to the tabloids. So the taped conversation is to Tucker reacting to that blackmail. Tucker captures it on tape and sells it for a whole bunch of money.
Bottom line is that Dog is not a racist, and yes he uses the "N" word, but not in a context that would make him a racist. And, by the way, isn't it racist to allow the use of a "sensitive" word by a select group of people, while denying other groups of people that same privilege? If that particular word is to be considered sensitive and derogatory, then it should be sensitive and derogatory to all racial groups, right? To believe otherwise is to acknowledge a double standard. And having a double standard is in itself racial bias.