Last time I looked; we wuz all a bit different from one another.
Arguing about WHY is about as useful as the old Angels on a Pinhead ‘debate’.
I disagree. The "WHY" is critically important in making policy decisions.
Currently, the accepted wisdom is that statistical group differences in performance is entirely due to environment, and that by sufficiently improving the environment of the lower-performing group, the group differences can be eliminated. The perceived duty is then to spend as much as needed to eliminate the differences.
If statistical differences in average group performance has a primarily genetic basis, then NO amount of spending will erase the difference.
This is why there is such hysterical upset whenever genetics is mentioned -- too many people would lose money and power if we stopped spending money on something that will not get fixed.