Very true. His bookHuman Accomplishments is a factual, statistical study and not a racist polemic. The Bell Curve by Murray and Herrnstein was the "stealth book" of the 90's. This book reviewed the psychological literature of the last 100 years. Nothing in the book was at variance with the literature. Indeed, 300 prominent academic psychologists wrote a supportive opinion of this book in the WSJ after comments accusing Murray and Herrnstein of racism.
The whole problem with liberals is they want equality of outcome rather than just equality of opportunity. In order to continue their mistaken convictions they must deconstruct actual data with a host of ad hominem attacks. They are beneath intellectual contempt.