Nobody wants to be held responsible for things that other people of the same race might do or might have done, but you'll find people wishing or demanding that other people be held responsible for what people of their race do or have done.
Basically, Chris Rock got his name in the paper, and got hundreds of people to comment about what he said. In the publicity world, that's a victory. There's not much more to it than that.
Yes, but he's paying for it: Now I think he's a celebrity knothead, like Janeane Garofalo. Yeah, Chris, low blow -- but that's what you get for dissing my people.