Pallid excuse.
Jews were awesome before the diaspora.
You know, I've considered that angle as well. After all, they were one of the first peoples to fully develop the idea of a monotheistic god. From a technological perspective, that is quite a leap from a pantheon of gods for every nook & cranny.
So, on one hand we have superior intellects from the days of Egypt, and on the other (or in combination), geniuses bred through environmental conditions.