system
Given the following post, respond as if you're commenting on Reddit:
human
[WH40k]What's life like under Chaos?

I know (and I probably shouldn't) that Chaos is this vast powerful evil thing that manifests all sorts of daemons and foul creatures to do its bidding, but they seem to have human soldiers. They must live somewhere, and if they live somewhere they must have some kind of society.

But how can you have an evil society? Surely the only true civilisation comes through the benevolence of the Emperor?
gpt
Chaos is... alien. You can't compare it to anything else in the galaxy as for Chaos not even the laws of physics hold true, it is pure will manifest. Followers of the ruinous powers do no longer feel like any other sentient being does. They feel merely the aspect of their respective God, no longer any of the things that define the lifes of normal creatures. No self preservation or drive to  procreate, or achieve a specific goal. They live for the moment.
Chaos is not evil. If you were to take the sum of it all you would end up with the average mindset of an average being in the galaxy.

A Khornate berserker feels nothing but rage and bloodthirst and an insane need to fight, a follower of Slaanesh only wishes for pleasure without any reflection etc.

They do not have a Culture and don't need one. In the Eye of Terror you do not necessarily need to care for mundane worries. They live as aspects of their gods without need for worries, rules or morals and do what they were meant to do.


All in all they are one of the happier races in WH40k, probably coming after the Orks sharing a place with the nids.