WH40K satirised fascism and far right by having the Imperium. The wars never ending and the ideology of Imperium fueled Chaos. Don't believe me? The idea of having humans rule everything would become stagnant, complacency rules all. Nurgle right there. The constant plotting between higher ranking officials served Txeentch. Slaanesh sees how the Imperium has enjoyed fighting, almost finding sexual satisfaction. Khorne just wants slaughter, doesn't care who dies. Imperium and Inquisition are too happy to kill heretics, chaos, witches, and xenos.