Having a belief system is different from having a religion. Organized religion likely came about out of the need to legitimize power structures (otherwise, why the hell would the populace, which outnumber the ruling class, not fight back against their injustices?)
You are right that the San seem to have a classless (or, as wikipedia describes it, egalitarian) society. So it works as a counter-example to my claim that "nothing predates classes".
Nothing really predates classes. Classes existed since the first civilizations on Earth. You might be claiming it predates capitalism and that's definitely true but the ruling/working class divide is much older than capitalism.
Well, that's appalling and I wholly condemn it and it's my bad for not doing the due diligence of figuring out who was behind the community before posting. It still doesn't excuse apologizing for authoritarianism on the other side of the aisle.
Can they enter a room or home with no specific owner?
I assume the permission you gave them to get them into that scenario to begin with doesn't get revoked once you die. Or does it? Vsauce theme Does the permission pass to your heirs? Can your child or spouse just show up and evict the vampire using that logic? What if the vampire doesn't just kill you but turns you?
More important question though we're all missing here: can vampires even cum? You assumed in your comment that they can maintain bloodflow by using the blood of their victims/consenting partners/wtv. but that logic wouldn't extend to sperm production. Unless they sucked a ton of cock beforehand and absorbed that as well.
While I agree that the Hyprland community is toxic and led by an open conservative (if not fascist), citing Drew DeVault's opinion piece is hardly better; he's known for being a tankie with biases of his own and the way he manages sway is toxic in its own way (though, admittedly, not in the same manner that Hyprland is).
If you asked me to produce a parody of what's wrong (sociopolitically) with today's world, I couldn't come up with something better than just a straight screenshot of that post.
But basically, the electrolyte balance that's healthy for a horse is quite a lot higher than what is healthy for a human (due to body mass differences, among other things). The magnesium in the horse electrolyte is actually over the lethal dose for a human if taken as written. You could theoretically take it and be fine if you calculate the proper dose yourself, but by that point you're better off just buying human products, I guess.
EDIT: I was thinking of manganese, not magnesium, but that's 1500% of the daily intake, not necessarily lethal dose. Sodium, though, is over the lethal dose.