I've never understood why it matters even if racial IQ differences are real and measurable. Being smarter than another person usually doesn't justify being an asshole the the less intelligent person.<br><br>Differences can be understood and not used to denigrate others, when other groups have their own advantages and disadvantages. For example, not recommending red heads (gingers) do work requiring them to be in the sun for extended periods, due to higher cancer risk, is logical. Had nothing to do with discrimination, so long as the red head still has free will to choose his line of work.