@FUTUREMAN There was actually an official short story I read that came out in the leadup to Psychic Awakening that was almost exactly that, and presented through a series of personal logs. A bunch of orbital cops are forced to engage in more and more brutal crowd control tactics to deal with the throngs of refugees the Awakening caused and eventually a disguised Khornate cult among the refugees convinces them of the Emperor's brutality and how his golden throne deserves to be adorned with the skulls of heretics. The story ends with them hopping in bed with the cult to go spread "the Emperor's" message to new worlds.
Also the actual 30K stuff under the hood is a lot like that, just fucked up by poor writing. Emps started off with wanting to just unify mankind to put an end to shit and then
a certain someone named Malcador put the idea in his head that he should call himself THE EMPEROR instead of just acting like yet another techno-barbarian. In fact, IIRC the man had been pretty damn instrumental in feeding into Emp's intentions and ambitions early on. Of course Malcador had betrayed the Sigilite Order of his that had been keeping safe mankind's knowledge throughout Old Night so it isn't like he's a particularly nice or trustworthy gentleman. Add in the stuff on Molech and IMO the most interesting twist would be if Malcador was originally a servant of Chaos intent on turning mankind's most powerful psyker into a servant of the Warp, but who wound up betraying Chaos in the end as Emps' own vision of a unified mankind free of the Warp replaced his devotion to the Dark Gods.
