It seems to me that intelligence is much like height.
Every child is born with the genetic potential to grow to a maximum height or IQ.
We know perfectly well how to change the environment to keep the child from reaching that maximum potential, but we have no clue how to help a child born with low height or IQ genes to grow past that point.
Which makes all the talk about “equality” more than a little creepy. The only way we presently know how to achieve it is to stunt the high achievers.
The libs would like grown adults to believe that every minority suffers from a bad environment which inhibits their intellectual growth. That stands reality on its head. Mnay millions of immigrants to these shores have come from horrible environments and immediately contributed. A bad environment was a strong impetus for them to succeed.
And again, if they, libs, don't believe in IQ, why do they support programs intended to increase IQ? Their whole position (like all lib positions) does not address reality.