First, only some of the attacks I cited were brief and sketchy; others were lengthier. Second, I have cited a few such attacks due to time and space constraints, but in fact they exist in great profusion. My personal impression is that the popular discourse on intelligence and race is drowning in confused rhetoric along the lines of what I parodied.

Finally, I think the last possibility you cite is on point -- there are many, many people who are not thinking very clearly here. As I said, I think these people also have come to dominate the debate on this subject (at least in terms of what one is likely to read about in the newspaper rather than a scientific venue). Instead of ignoring them and focusing on people who make more thoughtful and defensible variations of these points, I think some kind of attempt at refutation is called for.