Even better (or worse) than that. It was dysgenic for the German population. It was probably eugenic for the Jewish population. So what the Nazis managed to do was to help make the Jews racially superior to the Germans.
In other words, they managed to massacre 6 million people in order to achieve the exact reverse of what they said they wanted to do.
For the avoidance of doubt: (1) I think what they did was a horrible terrible thing, (2) although it was probably eugenic for the Jewish population it was dyseverythingelse for them, and in particular (3) I am certainly not suggesting, e.g., that Jewish people should be glad it happened or anything similarly monstrous. Also (4) of course neither "the Jews" nor "the Germans" is a particularly well-defined group biologically and I am not suggesting otherwise, and (5) I am not claiming that this sort of "racial superiority" is something anyone should be aiming at. Oh, and (6) I am also not suggesting that the worst thing about what they did is that it didn't achieve their goals. It would have been just as awful if it had.
I'm not sure my premises are correct, but this might be an example of LW's excessive emphasis on genes. I think you're saying that smarter Jews were more likely to survive the Holocaust. This might be true for German Jews (a lot of warning, a lot of people with resources to move-- and still, only 25% got out), but not so true about Polish Jews, where it happened very fast-- and that's where a very high proportion of the Holocaust happened.
Also, a major focus at LW is on extraordinarily smart people. Even if Ashkenazi Jews went from an average IQ of 115 to ...
A long blog post explains why the author, a feminist, is not comfortable with the rationalist community despite thinking it is "super cool and interesting". It's directed specifically at Yvain, but it's probably general enough to be of some interest here.
http://apophemi.wordpress.com/2014/01/04/why-im-not-on-the-rationalist-masterlist/
I'm not sure if I can summarize this fairly but the main thrust seems to be that we are overly willing to entertain offensive/taboo/hurtful ideas and this drives off many types of people. Here's a quote:
The author perceives a link between LW type open discourse and danger to minority groups. I'm not sure whether that's true or not. Take race. Many LWers are willing to entertain ideas about the existence and possible importance of average group differences in psychological traits. So, maybe LWers are racists. But they're racists who continually obsess over optimizing their philanthropic contributions to African charities. So, maybe not racists in a dangerous way?
An overly rosy view, perhaps, and I don't want to deny the reality of the blogger's experience. Clearly, the person is intelligent and attracted to some aspects of LW discourse while turned off by other aspects.