I think Yorkie did get it wrong with Tau and failed to acknowledge that their caste system was the way they prevented the Tau race from imploding and destroying itself. I do however think he's got Orks pretty much pegged. (Although I do believe that wise exception of Chaos none of the races of 40K are "evil"). He did miss the most pertinent Ork quote though (I think apologies if I missed it)

"All Orks are equal, but some Orks are more equal than others"

On a side note I was under the impression that Tolkien, in part at least, based Mordor or South Africa. Of course given his description of Orcs in LoTR this does give it a somewhat sinister overtone. And his Orcs are Evil as f**k.

I enjoyed the read though thanks 👍🏻