I can see you write with 1st hand experience on this matter and am treating that with the respect it deserves.
You will probably be aware there were multiple companies involved in the security across multiple sites.
I find it hard to disagree with what you are saying as a general fit to my understanding.
A quick google will reveal a couple of the guards caught sleeping on camera were caucasian and yes a bias of google pictures also confirm guards were weighted to non-caucasians including those folk of African decent and yes Indian folk too (of which I take no offence!)
Cheers.
