While you are correct that is certainly not the view most chaos warriors hold. You need to read more wordbearers. They're like the dark eldar of chaos worshippers.
I dont' need to read it, because it's already in my head. That's what they do, i dont need to read about the explicit actions they do with their victims. It's implied and that is good enough for me.
If they started to write down those actions for chaos... they would feel mundane - because humans in RL did it as well already. And since Loyal Space Marines are equally boring, they get "awesomified" by acting like chaos (see greyknights sacrifising
SoB and smearing their armor with their blood for example). Thus making Chaos Marines seem less evil in turn. It will go full circle, then everyone starts doing it and the problem is not solved. If Chaos Marines act like Dark Eldar, then Dark Eldar also "lose" their thing und they would be "boring" if we apply the same argument Wyzilla brought out.