There's an implicit assumption--mostly among liberals--that increasing the representation of minorities, women, and other underrepresented groups in business, government, policing, and other fields will cure many of our social ills.
This was true in the reporting on Ferguson where it was constantly pointed out how few African American cops there were, as if having more would reduce police brutality. We like to think that putting women in top executive jobs will lead to better child care in the workplace and a kinder, more gentle workplace. A lot of people feel having more women elected to office will result in a more peaceful world.
Diversity is an equity issue. I support it because it makes our society more just. I want more blacks on the Ferguson police force because it's clear that an entrenched and discriminatory system is keeping African Americans out. I want more female executives because I think women deserve the same chance as men to run a business. It's about equality of opportunity.
But beyond this, let's not fool ourselves. There are plenty of black cops who beat up black citizens, plenty of corrupt Latino politicians, plenty of women who bully their employees and make for horrible bosses.
Our society is not automatically going to become better because we have a more diverse workforce. I grant you the problems may change, but they are likely to be just as severe as the ones they replace.
The bottom line: Any racial, ethnic, gender group will have the same percentage of rogues, scoundrels, and thieves as the white population--no more, no less. It's just a fact—people are people.
Diversity alone can't solve our problems.