I'm intrigued by WH40K but I'll settle for reading the novels and shit for the same reason you say
There's a decent 20 minute video on the backstory of 40k here:
What I like about that guy is he's a soft-as-shit, love-is-love Orange Man Bad soyboy vegan who has spent the last 20 years studying pretend fascism. Playing the games, reading the novels, painting the figurines. It's never occurred to him that fascism's meeting an emotional need for him that's unmet in his real life; and when people ask him about it he just says "the other factions are bad, too" even though he's reeeally focussed himself on the fascist side.