Swaran Singh has done this pentrating analysis of 'ethnicity research' in the British Journal of Psychiatry: 'Shooting the messenger: the science and politics of ethnicity research'.
The abstract is below. Email Swaran on S.P.Singh@warwick.ac.uk if you would like a copy of the article..
Scientific arguments showing ‘how the world is’ are fundamentally different from political assertions about ‘how the world should be’. Ideologically motivated political attacks can hamper our understanding of mental disorders by preventing academics from pursuing research in contentious areas. Evidence should be countered by better evidence, not by shooting the messenger.