Lets take the conversation in that direction, see how it turns out.
When europeans invaded North America, the Indians bodies couldn’t defend against smallpox. The reason was because after generation and generation of being culled by smallpox, the europeans who were left were those who were more able to fight the disease. The Indians never underwent the culling, and the disease was far more severe for them. There are other examples (whites are less lactose intolerant and alcohol intolerant than Asians, because of our middle ages environment) you could list of evolution over the last few thousand years selecting for certain traits.
Seeing how Jews have lived at the edges of society and still had to make a life for themselves, and because they could be targets of both individual and society wide violence (including having everything stolen, being relocated, being killed en mass) I wonder if generation after generation the Jews who had the ‘life skills’ (for lack of a better word) to survive, thrive, pick up and start over, rebuild, be creative, etc. were selected for since those would survive. The ones who could navigate and survive a social, political and economic system stacked against them may have selected for character traits that made them more adept at those areas.
Like I said in the OP, Jewish IQ is 1 standard deviation to the right of the average. I don’t know the cause, and I don’t know how much was selection pressure because of social stigma making it easier for the smartest Jews to survive. But perhaps Jews have been selected for various other important life skills to survive and function through centuries of oppression, being robbed and being bullied.
IQ has a correlation with some Jewish success (nobel prizes, academia) but doesn’t explain other things like higher % of billionaires, why such a large % of Russian oligarchs are Jewish, why such a large % of US politicians are Jewish (compared to their % of the population) or why Jewish people are over represented in other successful areas like the arts.
If you look at the stuff done against Israel just in the last 70 years (several wars of aggression, terrorism, attempts at international isolation) people who have the skills to survive and thrive when they are being ganged up on are going to do better. Maybe the Jews had a bigger selection pressure for that in their history.
If there is any truth to that hypothesis, I wonder what traits would be selected for. Granted, other minority groups have been persecuted in world history. But I think the persecution of the Jews has gone on longer, and been far wider (since it covered most christian and Islamic nations, which make up the bulk of the world’s power) so there were fewer places to escape to.