Saying black people are genetically predisposed to violence and low IQ is flat out racist sir - no, Simon didn't actually say this. Please stop putting words in his mouth.
He pointed out that black people proportionately commit more crime, then wondered out aloud if genetics were involved. That's all.
And mean IQ varies according to ethnic group (just as mean percentage of fast-twitch muscle fibers, mean bone density, and mean percentage of melanin do). Different ethnic groups split many thousands of years ago and evolved mostly in isolation. Natural selection acts on different organs and body parts. All this may be an uncomfortable fact, but, sorry, it's a fact nonetheless.
This is an adult discussion. And adult discussions call for people of differing opinions to discuss difficult, sensitive topics.