The cause of the black-white IQ gap is not relevant to this thread - not sure why you brought it up - . The fact is that the gap exists and of course one would expect it to exist in the US prison population too thus the rest of my argument naturally follows. The crux of the matter being that rehabilitation works for Norway today but wouldn't work for US (today-near future). Cultural changes to raise IQs enough to be represented in the US prison population - sounds like a moon shot - is an entirely different discussion.
Keep the downvotes coming!