It's totally possible that intelligent people have well paying careers and give birth to intelligence advantaged children. Mother nature loves bestowing fortune to the fortunate.
There is the pervasive "blank slate" approach to cognition, when there is plenty of evidence that your brain is not in fact a blank slate at birth. I mean people just passively accept that some people are just born physically stronger, or with a more athletic build. Especially if their parents are athletes, or it runs in the family.
But bring up intelligence along with genetic factors and everyone recoils and tenses up. It seems so plainly true, there is plenty of evidence to back it, yet its article after article, discussion after discussion of "Kids who read books end up being more successful" and never "Naturally smart kids enjoy reading books".