In a massive, detailed 2000 study of the effect of court-ordered affirmative action plans on police departments, economist John Lott found that the more minorities on a police force, the higher the rates of murder, manslaughter, violent crime, robbery and aggravated assault will be

Violent crime increased by a minimum of 3.3% every year after affirmative action policies went into effect—and the spike in crime was highest in black neighborhoods. The problem was not with black cops, Lott’s study showed, but rather with the lowering of standards across the board, resulting in less-qualified officers of every race. As Lott’s study showed, once standards are lowered to ensure “diversity,” standards are lowered for all recruits, resulting in a rainbow coalition of incompetence.