This is a redated post.
This is an account of the life of Screamin' Jay Hawkins. The following item, in Jay's story, is what is interesting from the point of view of Darwinian ethics:
Hawkins left many children by many women. About 55 were known (or suspected) upon his death, and upon investigation, that number "soon became perhaps 75 offspring." 
Now from the point of view of Darwinian ethics, here is a screamin' success. This man passed on his genes 75 times! (I wonder what Wilt Chamberlain's numbers were?) But is this success? Was Hawkins even trying to pass on his genes? Or did he have more immediate goals in mind when these kids were conceived? Would Hawkins, an accomplished musician, even think that this was his own greatest accomplishment?
Yet, if Darwin's theory of evolution dictates moral norms, reproductive success would have to be the main goal of human existence. It's not, so Darwin's theory does not dictate moral norms.