> Yet most (western) countries immigration policy is set on the opposite assumption - that personality traits (of which IQ is only one) are not heritable.

This is something often said by white people who never had to deal with the many issues around migrating to Western countries, even though we have the entire history of eugenics and "scientific" racism proving the opposite.

> The caution and "well it's complicated" shouldn't run in only one direction.

That would assume that there are two equally valid opposing views here, and yet there is nothing here to back that up. Science doesn't run on "both sides"-isms.