Have you any proof that the tongue-in-cheek usage of in-universe phrases in any way leads to real life ideals?

The Warhammer community is made up of the most patient and tolerant people you’ll ever find. It’s inevitable: painting miniatures is an exercise in patience-building, and the fact that one will often play different sides of a never-ending conflict makes it very obvious that war between races solves exactly nothing. You can possibly take objection with some racist subtext (which is inevitable with anything originating from Tolkien’s “clash of civilisations” material, borne out of the tragedies in the first half of last century), and the fact that it’s a very white, very male subculture (simply out of causality: a slow and expensive hobby in very white countries will inevitably end up attracting people with time and money to spare - i.e. white men); but this does not result in a discriminatory community at all: warhammer players are often desperate to evangelise their hobby, and are extremely conscious of being a very small minority.

In the end, the whole Games Workshop lore is a mixture of “heavy metal” aesthetic, Tolkien tropes, and the “nihilism with a smile” reaction to Thatcher’s England that also gave us Dredd and “British Invasion” comic writers: if you take it too seriously, you become part of the joke.