Argument: Harder to keep the populace in line, if everyone has more power.
I think you're missing the existential risk inherent in Alicorns or how precariously Equestria is balanced on the knife edge of extinction. Here's a short list of possible extinction events: Nightmare Moon, Parasprites (Twilight enhanced), Discord, King Sombra, and god-knows-what from Star-Swirl the Bearded's library. 'Mere' civilization ending events are Smarty Pants Doll (enchanted), Parasprites (unmodified), Windegos, Changelings, and the duplicating mirror. This is a world with Cuban Missile Crisis going on every other month and a rogue AI power-equivelent popping up every year . Imagine if Twilight had accidentally made parasprites carnivorous in addition to eating non-edibles? Game over, for everyone, forever. It's not a world made safer by having more Alicorns. God-tier magic seems to override other Got-tier magic; in all God-tier confrontations, victory always goes to the initiator of each round of any fight. TLDR; offense > defense.
Also, you need to look at what Celestia herself has to gain. Right now she's the God Empress of ponies. The only people capable of challenging her are her sisters and other deity class entities. If the world were to be eaten by omnivorous Von-Neuman parasprites tomorrow, she could teleport to another planet and (presumably) re-start the pony race. She'd be sad, but life would still go on. The only way that ponykind could experience a true extinction would be if she and her sisters were to die. For every pony that Celestia decides to uplift, she makes herself a little more vulnerable. What motivation does she have to do that?
Celestia is very selective about who she uplifts, judging by Twilight. Notably, Celestia makes sure that Twilight benevolent, very grounded with friendship, selfless, understands the nature of when (and when not to) use magic, understands the existential risks of magic (firsthand), has dealt with god-tier entities and understands their limitations. There's a musical number about how Celestia's been testing her to see if Twilight's the kind of person who'd kill or enslave everypony if given limitless power. Twilight only gets uplifted when she passes all the tests.
Here's a related question: You have just been uplifted by an immortal, Friendly AI. How do convince it that you should start uplifting everybody who asks instead of people whom the AI deems non-dangerous? ...and why do you even want to convince it?
A large amount of the things you mention become less dangerous in the event of greater alicorn presence in Equestria, not more. Nightmare Moon, Discord and Chrysalis ALL almost won, and if even just a few dozen alicorns had existed, they wouldn't have stood a chance in hell.
Now, the whole existential risk angle...is a very interesting point, since based on what I've just argued, the logical meeting-ground between the two would be to have a task force of alicorns, say, at least a dozen, but no more than a hundred, all comprised of ponies Celestia trusted su...
EDIT: I am now taking arguments for alicornism. Alicornism being the placeholder term I've given to the stance that all ponies should be alicorns. Please PM me or post here if you have a good one, or an argument against one of anti-alicornism's strongest points: Overpopulation/over-use of resources, magical abuse/existential risk, or upheaval of the respect ponies have for their rulers due to their alicorn status. I would prefer general arguments for alicornism over counter-arguments if possible. Deathist / anti-alicornist arguments are still fine to post here.
Disclaimer: I'm not sure if this is worthy of a discussion post, but I figured, given the amount of people on LW who like My Little Pony, it would have at least as many potentially interested people as a regional meet-up thread would, so I figured I'd give it a shot. If this is too trivial or frivolous for LW, feel free to tell me and/or downvote, and I'll refrain from such threads in future. A place where I could go to find some help instead of the Discussion section would also be greatly appreciated in such a case.
So I had an idea for a one-shot or small novella, depending on how the plot developed, about an argument between Twilight and Celestia. Twilight finds out she's immortal now that she's an alicorn, and Twilight then decides that, given the standard anti-death concepts that immortality is good, death is bad, and so on, they should turn everyone who wants to be an alicorn into one.
The problem is, I'm having a very difficult time coming up with actual arguments for Celestia.
- Celestia herself is immortal, she's lived for well over a thousand years, and she isn't horrifically depressed, so clearly, immortal life is worth living and there's enough stuff to do with an extended lifespan.
- For the purposes of this fic, it's possible to turn anypony into an alicorn. I'm likely going to go with the idea that the spell can only be used a few times a year, but that's still enough to turn anyone who wants it into an alicorn within a couple of decades via exponentiation: The first targets can all be gifted unicorns who can be easily trained to use the magic.
- In most of the "Immortality sucks" fics I've read, the only real argument that immortality sucks is that you have to watch everyone else grow up and die. If a large majority of the population were turned alicorn, this wouldn't be a problem anymore.
- Nothing in canon suggests that there's any sort of religion in Equestria. Even in fanfics I've read, I've only read one fanfic where someone made up an afterlife that some ponies believed in, and in many more that I've read, Celestia's name is actually used in place of God in various sentences, like "Oh for Celestia's sake!" Thus, it's unlikely they'd believe in an afterlife: Both in canon and the majority of fanon, the closest thing to a God appears to be Celestia herself.
I've come up with arguments for Celestia by roleplaying the argument out by myself, but I haven't come up with anything that Twilight can't just shoot down, and I'd prefer if the argument wasn't just Celestia getting steamrolled, and I'd like to do this by strengthening Celestia's side, not weakening Twilight's.
Is the argument for deathism really that weak? I've read over the Harry vs. Dumbledore deathism argument in HPMOR several times looking for ideas, and IIRC Eliezer actually claimed he steel-manned Dumbledore's position, but I don't find anything Dumbledore says convincing in the slightest, and ended that chapter feeling that Harry was the clear winner in that debate, and that's with Dumbledore having access to arguments that Celestia doesn't, given that in the Potterverse, nobody actually knows what it's like to be immortal, and Dumbledore believes in an afterlife.
Some other arguments I've come up with for Celestia:
Argument: We can't just have a massive ruling class.
Response: There's no need for alicorns to be royalty. "Princess = Alicorn, Alicorn = Princess" is only something that law and tradition dictate: They can be changed. After all, Blueblood is a prince and not an alicorn, and it's certainly possible for an alicorn to NOT be royalty, if the princesses wanted.
Argument: Harder to keep the populace in line, if everyone has more power.
Response: Celestia's not exactly going around fighting criminals herself with her alicorn powers, so Celestia being much more powerful than others isn't necessary to keep the peace. If anything, an alicornified populace is MORE likely to be able to govern itself: Atm, a pegasus criminal can only be pursued effectively by about one-third of police officers, for example.
Argument: Overpopulation.
Response: One response to this is the idea that, starting a year or so from a royal edict, ponies who wish to be changed into alicorns aren't permitted to give birth more than once or twice. A broader response is that "overpopulation" isn't actually a reason to oppose alicornification, it's just a problem that has to be solved in order to do it. Saying "There'd be overpopulation" and then forgetting about the entire idea would be like Twilight saying that they didn't know how she was supposed to save the Crystal Empire from being banished again when she got given the task, and responding to this by saying "Oh well, guess that's it, we may as well pack up and go home." rather than trying to actually solve the problem. That said, this is the only truly legitimate argument I've come up with, an argument that requires real thought to fully defeat, rather than an argument that has an easy response leap to my mind.
Argument: Mortals wouldn't understand the consequence of their decision.
Response: Again, several arguments for this. Firstly, there's no reason to believe the alicorn transformation is irreversible, even if it's not currently known how to transform it back. Secondly, Celestia can already predict the consequences, and since she thinks HER life is worth living, clearly there's a solid chance that other ponies will have their lives worth living as well.
So, the questions to ask:
Are there good arguments for Celestia I haven't thought of?
Are the arguments I've already posited sufficient to not straw-man the lifeism position, and to allow for a reasonable argument?
EDIT: I am now taking arguments for alicornism. Alicornism being the placeholder term I've given to the stance that all ponies should be alicorns. Please PM me or post here if you have a good one, or an argument against one of anti-alicornism's strongest points: Overpopulation/over-use of resources, magical abuse/existential risk, or upheaval of the respect ponies have for their rulers due to their alicorn status. I would prefer general arguments for alicornism over counter-arguments if possible. Deathist / anti-alicornist arguments are still fine to post here.