The thing is, after Dark age of Technology and birth of Slaanesh Chaos had its way with humanity. Warp storms were everywhere. Demons were everywhere. Yet despite all of this, what Emperor had found after the old night wasn't degraded, Chaos infested demon worlds. There were certainly fair amount of them, but Chaos never seemed to willingly invade and conquer planets as there was suspicious lack of them. Even when Emperor's crusade did encountered Chaos world, they often could not tell at all that they were worshipping dark gods despite years of integration into Imperial society. Look at dark angels novel at how world who sold their souls to Chaos might look like. Or for example, look to Alpha legion Horus heresy book to find out how world who succumbed to Chaos looks like. In those cases, we see stable societies functioning perfectly fine. Lorgar also landed on a Chaos world. Emperor spent like an year on it. Even he couldn't tell that something was very wrong at its heart.
Chaos gets a bad reputation of being just about murdering, sacrificing and madness while in reality it is much more than that. You can't build society if demons are slaughtering every mortal they can find. You can't maintain an army without some lowly peasant being free to harvest food. You can't make bombs without factories. Factories has to have workers in them. Workers need raw resources. Someone has to mine them. Someone has to transport them. W40k lore constantly focuses on outliers, an extreme ends. Most high profile things which Chaos does. Talking about human sacrifice in Chaos is like saying that in Imperium everybody gets lobotomized and made into servitors, because this is how Adeptus Mechanicus gets most of its work done...
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