Well, whatever other factors are involved, genetics and good old evolutionary survival of the fittest are almost certainly involved. Jews have been under relentless persecution by various factions for at least a couple of millennia. It only stands to reason that the shrewdest and most intelligent of them would be the most likely to survive and pass on their genes to the next generation.
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No precept or claim is more suspect or more likely to be false than one that can only be supported by invoking the claim of Divine authority for it--no matter who or what claims such authority.