:I'm afraid to say this article attracts idiots from both sides of the debate. I agree, there needs to be more positive stuff. It also needs to be pointed out that Koestler himself was not some anti-Jewish racist, even if the far right has jumped on his thesis.  

 :As for the DNA angle, this is important, but again, Koestler was writing at a time when genetics was much more primitive. This could be dealt with more briefly, and with links.