I'm arguing the point, yes. I'm saying that IQ is an arbitrary measure and who knows what it's measuring. Others have pointed out that race is also an arbitrary category and that skin colour is not necessarily the same thing as having the same genetics.

So basically we have an arbitrary measure correlated with another arbitrary measure. We don't have much to draw firm conclusions on.

And that agrees with the other thing you bring up:

>> "Iq .. is a massive predictor for success in life."

That may just as well be an outcome of racial bias against non-whites in the US. In which case, IQ would be a pretty accurate measure of racial bias, but not of intelligence.

You're asking "so why do blacks score lower in IQ tests?". I'm answering: who knows why. The fact that they do means the test is probably broken, not that they're less intelligent for real.

Basically, any test result that just so happens to agree with some widely held societal belief should set the bias alarm off.