Why would the number of members of your group in the hiring pool change the morality of the situation? Take, for example, a business in a majority black neighbo

Why would the number of members of your group in the hiring pool change the morality of the situation? Take, for example, a business in a majority black neighborhood preferentially hiring white people. Seems bad. I think I prefer the "historically marginalized" justification more, although I think that has its own problems.