> That would assume that there are two equally valid opposing views here, and yet there is nothing here to back that up.

So why does the opening of https://en.wikipedia.org/wiki/Heritability_of_IQ say "Twin studies of adult individuals have found a heritability of IQ between 57% and 73% with the most recent studies showing heritability for IQ as high as 80% and 86%."?

Is the mountain of research on the heritability of psychological traits so obviously 'nothing', you don't even have to bother giving a source for your claim?