First of all, there is the moral case: Certain groups have been kept away from positions of power & wealth to such an extend that taking remedial action is warranted.

Secondly: there are obviously some differences in the behavior, knowledge, and culture of different groups and it is beneficial for a company to include those and profit from it.

But... you can't have gone through more than 14 years of life without having heard all thread a few times, can you?