You're not supposed to talk about it because the people who talk about it don't want to talk about slavery and Jim Crow. There were laws prescribing the death penalty for
white people caught teaching black people how to read. Slaves were released into debt peonage while their owners were paid reparations. Control things for wealth, and the wealth of relatives, and all of the statistics start to favor the descendants of slaves.
Slaves never discovered the philosopher's stone, so they never managed to turn lead into gold, but since nobody cared about entertaining us, we had to entertain ourselves. How did that turn out?
IQ is an obsession of low-IQ people. Smart people understand that you can become smarter by learning rules that allow you to process the information you receive in a better way, and that this process is endless. Dumb people think that smart people are magical, and were born with special powers that you can measure by looking at them really hard.
If the race IQ people were serious, they'd be making arguments that the low-IQ races should have disproportionate interventions. Instead, they're just trying to retroactively justify the selfish brutality of their disgusting ancestors.
worthless addition: I have to mention that I got into Mensa, or else people think comments like this are sour grapes. They love speculating about people's internal states over a good argument, as much as they love a simple scalar over a complex nonlinear process.