There are representations of honourable khornite followers, ones who can and do control the rage inside them, these mostly come from the writers who understand that all chaos isn't "eat a baby for breakfast, go do some killing, eat another baby".
The people that live in the eye and other chaos planets have a culture, economy, diplomacy (of a kind) and are just as much an empire as the imperials, elder etc. It's just chaotic and while some are utter anarchy others are well run and organised.
Take a look at any of adb's or abnets work on the subject and you can see there is a hell of alot more going on with chaos as a whole than what the limited blurbs in the codexs suggest.
I'D even go as far as saying that the codex writers these days haven't got a clue how chaos works as a concept, I'd bet pennies to pounds that most of us on here know more of the subject than most of them.
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