Why it seems as though there are so many dangerously mad black men in Britain and the United States

There is a far greater genetic propensity for people of sub-Saharan ancestry to develop schizophrenia than is the case with white Europeans, and for this illness then to manifest itself in violence and murderous aggression Curtis, David (2018) Polygenic risk score for schizophrenia is more strongly associated with ancestry than with schizophrenia, Psychiatric Genetics: October 2018 - Volume 28 - Issue 5 - p 85-89. Dabbs, James M. Jr; Carr, Timothy S.; Frady, Robert L.; Riad, Jasmine K. (1995) Testosterone, crime, and misbehaviour among 692 male prison inmates, Personality and Individual Differences, Volume 15 Issue 5 May 1995. Pinto, Rebecca: Ashworth, Mark: Jones, Roger (2008) Schizophrenia in black Caribbeans living in the UK: an exploration of underlying causes of the high incidence rate, British Journal of General Practice, 2008 Jun 1; 58(551): 429–434. Richard, A.; Rohrmann, S; Zhang, L.; Eichholzer, M.; Basaria, S.; Selvin, E.; Dobs, A.S.; Kanarek, N.; Menke, A.; Nelson, W.G.; Platz, E.A. (2014) Racial variation in sex steroid hormone concentration in black and white men: a meta-analysis, Andrology May 2014 2 (3): 428-435.