A Chris Rock routine or even a gangsta rap album are not comparable to Michael Richards' tirade. They just aren't. That's not white guilt, just an ability to look at things and call them what they are. Has Louis Farakkhan said things comparable in their offensiveness to what Richards said? Absolutely. Are there black racists who say things just as vile, and are far more serious about it, than Michael Richards? No question. But you've spent a lot of time and effort trying to counterbalance an act of white racism with acts that don't come close to balancing.
Minister Farakkhan has never been made to publicy apologize for his statements. Instead we are told of the good works his "millions" of followers do in becoming aware of cultural, racial, societal, and political issues.
His words of hate carry more weight because he has a cult of followers and defenders in the media and in public office. Michael Richards is a lonely comedian who will be ostracized.