I'll say this, then (much like CSD and cops) I'm done wasting my time arguing this.
Genetics are an incredibly complex and not fully understood field, especially as they pertain to the mental facilities. This is in part because the mental facilities are not themselves well understood. Genes and their interaction with environmental forces cannot be properly controlled (at least in humans). IQ is like BMI; broadly useful statistically but it shouldn't be treated as some type of hard scientific number. Plasticity of mental facilities is not well understood. And finally, almost all of the researchers in this area are basing their assumptions on the idea that humans are 1. just animals like any other 2. sacks of random chemicals that random chance assembled. We are just sacks of chemicals reacting in a way too complex to understand, and things like free will and consciousness are mere illusions. I wholeheartedly reject that assumption.
Is there a genetic component to intelligence, however we are choosing to define that this month? Sure. How large is that component, in terms of points of delta between the various ethnicities? What effect does environment have, and how does it interact with the genetics ie genetic resistance to environmental factors being portrayed as increased intelligence. What are the limits of neuroplasticity in regards to intelligence? And most importantly, what are the actual effects of the various intelligence deltas?
We don't know. We really can't "know" in the scientific sense as this dwells in the murky realms of the social "sciences" (which actually aren't) and statistics which are only as good as the data fed them and the interpretation done to it.
But let's set that aside. Let's say that genetics is the major factor in intelligence, environment is substantially smaller, resistance to environmental factors is a constant, and neuroplasticity is very limited and cannot compensate for inherent genetic ability. Let's say we're just walking sacks of random chemicals with a delusion of consciousness. And let's say we can actually determine this in a rigorous manner. Let's stipulate this from a "best case" scenario for the genetic intelligence camp. And let's further stipulate that this is a significant gap.
Even giving up all those unproven points, the conclusions that are being drawn from this information would not be justified by the facts in evidence. I believe that even if Group A's median intelligence is 20 points higher than Group B's, but Group A has significantly worse external variables growing up1 then the average desired result 2 will more frequently be achieved by Group B.
1: Group A are significant majority trailer trash / hood rat parents and environment, Group B are significant majority stable two biological parent with adequate education and socialization.
2: Functional member of society, not a mala in se criminal, low time preference, capable of holding a job, and of raising offspring with similar traits.