The tool itself is not at fault. The way that we have stripped ethnicity out of the tool is the cause of the problem. If i remember correctly the basis of the bmi was developed in Britain. The ethnic brits are on the smaller and shorter end of the white family of ethnicities. Meanwhile if we look at the germanics we find broad shoulders and medium heights. Our northern tribes seem to be our tallest.  Multiculturalists deny reality and cant see the forest for the trees.