Seriously, their society sounds so overtly positive in the face of a preposterously hopeless and uncaring universe, there’s no way even the codex is telling the truth.
It’s like being stuck in a malfunctioning elevator with the Adoring Fan from Oblivion, or trapped in a burning home with Ned Flanders; the overt positivity just seems like it’s projection and there is a hidden darkness element somewhere waiting to come out.
The “Greater Good” religion simply sounds too good to be true. So they should all be destroyed, and their societies wiped from existence.
Edit: it looks like many people here don’t understand the obvious hypocritical irony and sarcasm written here…
If T’au are that purely good, then it help justify IoM’s cruelty. T’au empire is so tiny that it can be squashed by any faction. That’s why you need to be cruel to survive.
The empire also proof that IoM is needlessly cruel, which make it grimdark as well. You need a light to know how dark it’s.