I personally don't care whether the geeks who work at a given tech firm are of particular gender or race, as long as they produce quality stuff.
I would care if someone couldn't get into the industry because they are X - but if these individuals don't want to - it's not something I consider a problem.
The point I was making that increasing numbers and diversity in something means more stuff is produced and there is greater innovation. It means the pool of candidates for a given role is larger, allowing better selection. This is all self-evident - as Bill Gates has said, doubling the size of your workforce cannot help but improve things.
However - on my side is every single real-life example of success in tech. EVERY SINGLE successful technology company was NOT diverse (and only once they get big enough to be targeted by diversity scammers that they start to pay lip service to this). Therefore if diversity was indeed at all important, wouldn't you be able to point to examples of more diverse companies being actually more successful? Heretofore the empirical argument is 100% against you.
To put it another way, the concept of disruptive change is when some company does something different than all the other companies have done up to that point. I imagine uber, airbnb et al being told by someone that the 'empirical evidence is 100% against them' as well.