I think the argument that there's no reason to believe people in different areas do worse or better in IQ tests is fairly believable. The issue is whether it's about cultural differences, educational ones, genetic ones, even maybe some others. Watson's great 'appeal to reason' based on a couple of his friends experiences with black employees suggests that he might be a tad biased on the issue. That's my understanding anyway. (That was understatement by the way in case anyone missed it.)