Killing is going to be the result of inner city poverty with little upward mobility.
I don't accept this. Killing is a function of low intelligence and impulse control. Lack of empathy and morality is correlated with low intelligence. Not all black killings are in the inner city, by the way. There are plenty throughout the South and rural areas of states like Florida.
None of the immigrant groups that started in the inner city engaged in senseless killings of the scale we are seeing with blacks.
There hasn't been enough scientific evidence to prove racial disparities in IQ are genetic or not either way.
The mainstream answer in the scientific community is no less than 40% and no greater than 80% genetic. After 50 years of affirmative action with little movement on the IQ scale, the hereditarians are getting the upper hand. Every other ethnic group that has worked its way out of poverty has shown improvement in measured IQ over time. Not blacks.
In order to prove what you're suggesting you would actually have to find what alleles actually determine IQ performance as the alleles that determine skin color/physical features almost certainly have no genetic determination for IQ.
It would be a complicated combination of alleles. The databases are out there, but there is heavy political resistance to using them to close the case on the IQ debate. I started a thread on that a few months ago. Why is this? Perhaps there is concern that socialists will have a better argument if it is established that achievement has more to do with the luck of the draw rather than 'merit.'
It's clear that black people can still be at the upper extreme in intelligence.
That's true, but there aren't very many. That's how statistical distributions work. Keep in mind that the North American black population has a heavy white admixture that boosts the right hand tail of the black distribution curve.
You could look at places like Appalachia for a fairer comparison.
Not comparable. Children of poor whites in Appalachia have higher IQs than children of black professionals, and they are a full standard distribution higher than poor blacks. Not by much, but slightly higher. I have posted studies on this before.