My point is that offering up IQ as an explanatory variable which alleviates any obligation to help another group is cowardice. Even accepting that IQ difference is an irrevocable consequence of genetics (which I don't), the next step is not "so it's their fault and we should not help them because they don't help themselves".

Which is the point of the DS analogy. It was an appeal to what I consider fundamental humanity. Perhaps it was a waste of time as an argument. Perhaps I should have just stuck to pointing out how fundamentally flawed the idea is; of formulating social policy on a metric as flexible as IQ.