And the sacrificed psykers are the unstable ones who could literally explode into a pile of daemons at any second. The psykers who are stable enough to not explode get trained to be interstellar telephone operators or to sit in a big circle thinking of good vibes to try to counteract all the bad and discordant vibes that occur from billions of residents of a megacity going about their chaotic daily lives, in order to stop literally hell from manifesting into reality from there being too many bad vibes around (this is literally canon, I think it got mentioned in a Dan Abnett book though I can’t remember which one).

Like it’s definitely a cruel and unfair system and the cruelty psykers experience is shitty, but at the same time I don’t really know what the actual correct way to deal with “this person literally warps reality around themself and can become a portal to literal hell if they fuck up even a little” would be. There’s actually Psyker dialogue in Darktide where one of them is literally asked “You’re not gonna explode, are you?” and just giving this earnest response that was something like “I certainly hope not, but you never can tell.” “That’s not very reassuring.” “Tell me about it, it scares me too.”, which I think is the bluntest and most personal I’ve ever seen 40k writing get about that problem.