Sure, by no means am I trying to make some argument that immigrants or manual laborers are worse or inferior. In fact the opposite!

I'm trying to say that regardless of who your parents are, your intelligence is primarily driven by your education (and your attitude towards education), with slight variance for genetic factors.

Therefore, we should not be anxious about "dumb people reproducing en masse" (as GP was).

We should be worried about educating everyone equally and fairly.

"Early twin studies of adult individuals have found a heritability of IQ between 57% and 73%, with some recent studies showing heritability for IQ as high as 80%. IQ goes from being weakly correlated with genetics for children, to being strongly correlated with genetics for late teens and adults."

I don't think 50-80% heritability should be hand-waved away as "slight variance". I think what you're talking about is the manifestations of the intelligence (i.e. you can't be a rocket scientist if you never had the chance to learn about it), but not the intelligence itself.

We disagree on the predictive power of twin studies.

Also please cite actual studies rather than Wikipedia. You’ll capture more nuance.

We conclude that there is now strong evidence that virtually all individual psychological differences, when reliably measured, are moderately to substantially heritable

For example, citation 6 implies nearly every personality trait is inherited, which seems aggressive to me.

Citation 7 is a book about how the genetic links get stronger with age, which seems also odd to take at face value.

Anyway, as great a source as Wikipedia can be, I wouldn't take its summaries at face value.