Ok, maybe the second paragraph is kinda bunk, but there's still good stuff in the third paragraph.

I mean, the question is 'diversity in the workplace' in western nations pretty much comes down to asking the questions of 'why should your workplace not roughly reflect your hiring pool' and 'why should your hiring pool not roughly reflect your demographics'. There can be good reasons for why either may not the case for specific instances, but unless you can give a good reason, then you're either actively screwing people over, or participating in some sort of systemic activity that's screwing people over.