!!FridgeLogic
* How would Equestria possibly beat humanity in a all out war? Sure, Unicorns can cast spells fast enough to act like guns, but that's only a third of their population. Humans have artillery more powerful than anything we ever saw in the show.
** Fics that explore that have it be due to the Barrier would ultimately destroy any unconverted humans/settlement, making humanities military advantages irrelevant.
* How exactly is Equestria going to support (as in feed and house) an influx of millions, if not ''billions'' of new residents?
** The ''Calm Before the Storm'' side story for ''Fanfic/TheConversionBureauTheOtherSideOfTheSpectrum'' gives us the very clear answer: ''they can't''. The Solar Empire is already taxed by the war and can't shoulder the influx of two billion newfoals. The environment is in shambles due to rapid industrialization (to provide jobs for the newfoals and churn out new war machines), the newfoals live in horrible poverty (and are often exploited as slave labor) and there are massive food shortages going around too.
** It also addresses more FridgeHorror: The Barrier is destroying any of the human infrastructure they ''could'' have used to actually support them.
* Chatoyance's stories have earth under the rule of a MegaCorp on par with [[WesternAnimation/WallE Buy n Large]]. Considering the backstory was that the economy completely collapsed ''and'' not to mention the fact that there are 196 countries in the world (who all have their own governments, systems, traditions, etc.), how exactly is this set up going to work? ArtisticLicenseEconomics does not even ''begin'' to decribe the massive leaps of logic this will require.
* Considering Equestria has plenty of other sapient species (donkeys/mules, cows, buffaloes, Diamond Dogs, dragons, and gryphons), [[WhatHappenedToTheMouse what do they think]] of an entire species being forced to become ponies?
** Some {{Deconstruction Fic}}s have pointed this out, and most of the time, they're not very happy about it. Case in point ''Fanfic/TheConversionBureauNotAlone''.
** In ''Fanfic/TheConversionBureauTheOtherSideOfTheSpectrum'', they were unable to complain, since the Tyrant killed most of them off first. Whoever's still surviving is fighting alongside the humans.
** In ''Fanfic/TheNegotiationsVerse'', the majority of them couldn't complain since they were all left behind on the planet to die when Celestia took Equestria and relocated it to Earth. When the non-ponies living in Equestria revolted against Celestia, she ordered them all to be rounded up and imprisoned until the war with humanity was over, and then, after they escaped and tried to flee on stolen ships, they were attacked and destroyed, leaving no survivors. And though the order came from the personal initiative of one of Celestia's soldiers, she [[LetNoCrisisGoToWaste praised the attacker and blamed the humans for it to boost ponies' fervor in fighting or supporting the war]].
* Some stories have Equestria just randomly popping up in the middle of an ocean. Where did all that [[NoEndorHolocaust displaced water]] go?
** ''Fanfic/TheConversionBureauTheOtherSideOfTheSpectrum'' actually addresses this, even having Twilight going off on the scientific reasons about exactly why this is impractical. Besides the massive amounts of magical energy it would take to transport an entire continent to another dimension, that is. Here is said rant, reproduced with all links in the event that you are curious:
-->'''Twilight:''' [[LetMeGetThisStraight Is that what you're saying?]] That somepony popped Equestria out of our reality and [[WhenDimensionsCollide crashed it onto his]]? How's that even meant to work? [[SciFiWritersHaveNoSenseOfScale Several trillion tons of continent]] [[ColonyDrop does not make a gentle impact on another world]], not without [[GiantWallOfWateryDoom mega-tsunamis]] and earthquakes that would level entire cities, followed by a dust cloud that would blanket the world in an artificial winter lasting decades! [[WhatHappenedToTheMouse And what about the world we leave behind, what about Equus?]] Would it just carry on spinning without a care, despite having a hole several-thousand-miles-across gouged out of the planet's crust? Even if you didn't breach the mantle, creating a supervolcano that would pull the planet inside-out, the change in mass and absence of the Princesses would throw the sun and moon out of their orbits, causing them to collide, or even worse, [[ColonyDrop to impact with Equus itself!]] [[FridgeHorror Anypony – anything, left behind would die, horribly!]] Every griffon, every dragon, zebra, reindeer, whatever!
* Why doesn't humanity do some kind of space program (make ships where a decent sized group of people can escape the earth before the purification spell hits)? And then you wonder ButWhatAboutTheAstronauts...
* How can ponies claim that HumansAreBastards and that "Ponies are the Superior Beings, incapable of doing wrong," when we've seen ponies (and other species in canon) act in ways that are remarkably antagonistic, ''including'' the Mane Six?
** MoralMyopia. Remember, they're committing genocide without really considering the repercussions.
** It's usually also FanonDiscontinuity, especially with Chatoyance's work. [[IRejectYourReality She rejects]] any part of the show that doesn't fit with her ideals, including the times when ponies show that they're just as flawed as humans.
* Chatoyance's world has technology being destroyed by magic, yet her potion is explicitly stated to be a mix of {{nanomachines}} and magically charged liquid. Why doesn't the magic from the liquid destroy the nanomachines and render the potion useless?
** She also has the human killing techbane barrier being deliberately created by Celestia,so maybe that tech was made an exception to further her plan, or they just made it outside of Equestria, as only the barrier magic is said to mess up technology
** ''Recombinant 63'' (a prequel to her TCB series), finally revealed the answer: To prevent magic from destroying the nanomachines, they used magic to construct and power the nanomachines.
* The conversion serum is stated to cure many diseases and genetic conditions and handicaps. So why don't the scientists and ponies find a way to make a cure for these conditions ''without'' requiring the changing of the drinker's body and mind?
* In just about all imaginings of the TCB universe, magic is stated to be harmful to humans. However, the potion is a magically charged liquid. Wouldn't the potion itself be lethal?
** Plenty of things are harmful but don't have immediate effects. If the potion turns them into a pony before the magic kills the human, they should be fine, for given definitions of "fine".
** Who would volunteer to test it? It's no different than saying "This acid gave me a chemical burn on my hand, so Imma drink the whole bucket to see what happens."
* In Chatoyance's stories, religion is evil. Yet the ponies are, in essence, a highly religious society, as Celestia is an object of worship.
* How does the barrier distinguish between human-made things, which it vaporizes, and natural things, which are left untouched?
** [[AWizardDidIt Magic, of course.]]

!!FridgeHorror
* Ponification will result in the destruction of the human race; the ponies are committing genocide.
** Even without ponification, the barrier and/or [[FantasticNuke purification spell]] will erase all of humanity and its artifacts.
* Working off the first question raised in the Fridge Logic section, how many people ''were'' ponified vs. killed by the barrier, the [[FantasticNuke purification spell]], failed ponification [[TakeAThirdOption or]] [[BetterToDieThanBeKilled killed]] [[DrivenToSuicide themselves]]?
** According to Chatoyance's story ''The Reasonably Adamant Down With Celestia Newfoal Society!'', which takes place several years [[AfterTheEnd after Earth was destroyed]], ''over 50%'' of the human race died, mostly from apparent [[DrivenToSuicide mass suicide]] (note that by this point, the world population was roughly 18 billion). Even worse, most of the survivors are indicated to be from the last holdout regions who were [[ForcedTransformation forcibly converted]] by World Gov emergency response teams.
* Most Conversion Bureau stories only mention the United States and make it sound as if it's the only country. Although it's most likely a case of CreatorProvincialism due to most writers of these fics being American, it still brings up the question of what possibly became of the rest of the world. It's made even more horrifying when you never hear of people outside of America being offered the chance to be "ponified."
** Several fics take place in Australia, a couple in South America, and many allude to the European bureaus. This example is mainly a result of the earlier days of the 'verse when things weren't mapped out as well yet, and [[CreatorProvincialism authors focused on their own settings]].
** Averted in ''Fanfic/TheConversionBureauTheOtherSideOfTheSpectrum''. While the main story does take place in the New York/Boston area, it's made clear it's a worldwide conflict, with warriors from around the globe appearing.
* In Chatoyance’s ''27 Ounces'', it's stated that two ounces of ponification serum is the absolute lowest amount that has been successfully used for conversions, with anything less inevitably resulting in a horrifying and painful demise as the subject is only partially transformed; three ounces is the official dose, for safety reasons. While usually ingested to ensure proper effect, contact alone is all this is necessary. Later stories see the serum used as a spray for the purpose of mass conversions. In addition, the PER has weaponized the potion in the form of specialized ordnance. In one case, they used ''[[ImprovisedWeapon squirt guns]]''. It's not at all difficult to imagine how often these less-controlled methods of delivery would fail to add up to even two ounces of total exposure. In that case, the PER was probably responsible for ''many'' more deaths than the HLF.
* Celestia seems very nonchalant about exterminating an entire species. In addition, many TCB fics ignore the existence of Diamond Dogs, gryphons, dragons, etc. Does that mean Celestia already exterminated the other sapient races that inhabit Equestria?
** She ''did'' in ''Fanfic/TheConversionBureauTheOtherSideOfTheSpectrum''.
** In ''Fanfic/TheNegotiationsVerse'', she didn't directly kill them off, but she did leave them all behind on Equus while relocating Equestria to earth. And without the princess there to move the sun and moon, all life would have died within five years... and then we find out that [[spoiler:Equus was doomed anyway because its sun was dying]]. Meanwhile, the non-ponies living in Equestria tried to revolt against Celestia and flee on stolen ships, but they were attacked and destroyed by the Equestrian navy, leaving no survivors. And while ''Choice'' would show that the order to do so came from one of Celestia's soldiers, she [[LetNoCrisisGoToWaste used it as a way to further radicalized the ponies by blaming the humans for it, and praised the attacker's deed]].
* What about the animals on Earth? Something that would destroy all human life would have no way of differentiating between humans and, say, monkeys or bears. The barrier also destroys human made structures, which means that all of the human constructions designed to prevent disaster would fail THE MOMENT that the barrier reached them.
** Not really a Conversion Bureau fic, but [[https://www.fimfiction.net/story/188262/invasion-of-the-ecosystem Invasion Of The Ecosystem]] shows what can happen when earth animals get transported to Equestria. Long story short, African Fire Ants 1 Everfree 0.
** And that's not even getting into the nuclear power plants! The barrier would destroy the buildings and reactors, letting loose ''a lot'' of radiation, killing and/or horribly poisoning anyone for doing something as simple as breathing.
*** Building off of that, nuclear waste. It's usually (mostly) safely contained... in human-made structures. Barrels holding the stuff would vaporize as the barrier hit them, spreading their contents across Equestria.
*** In [[https://www.fimfiction.net/story/29404/the-conversion-bureau-the-price-of-generosity The Conversion Bureau: The Price of Generosity]] this is one of the many problems Equestria has to deal with, a news broadcast reveals that an irrigation project in China was ruined because the water was diverted through a fallout zone and Shining Armor died of radiation poisoning. Turns out, since the barrier wiped out things like nuclear waste containment sites without a trace and the ponies never really paid attention to where they were to begin with they frequently built in contaminated areas by accident. [[NeverMyFault Naturally]], some ponies blame humans for this.
* What about disease exchange? Ponies would have absolutely ''no'' way of protecting themselves against human illnesses, since they would never have encountered them before. The barrier couldn't protect them, since it couldn't destroy bacteria without sterilizing the soil. Humans might be all dying off due to magical radiation, but the ponies would be all dying off because some human didn't cover their cough (or some anti-pony group purposefully used biological weaponry) and infected a pony with a disease that humans have antibodies for, but ponies don't.
** In [[https://www.fimfiction.net/story/163052/1/conversion-bureau-the-harshest-lesson/the-harshest-lesson The Harshest Lesson]] the planet gains self awareness and considers the ponies to be a disease due to their attempts to control nature. It starts attacking them with everything it has including incurable disease, animal attacks and natural disasters.
* There are a ''lot'' of authors who see the pony genocide as a good thing -- usually vehemently defending their viewpoints and/or cheering the ponies on. The fact that they are celebrating ''[[KillAllHumans a deliberate killing of humanity]]'' sends some ''very'' disturbing messages.
* Something I thought of after seeing ''WesternAnimation/InsideOut'': In Chatoyance's fics, Newfoals can feel no negative emotions. But all those negative emotions have a purpose. For example, without Disgust, they could, say, eat Pinkie's baked bads until they died of food poisoning, because Disgust is the way the body tells you 'Ugh, this is bad and possibly poisonous. Stay away!' Without Anger, they'd be [[ExtremeDoormat total doormats]], because anger prompts people to defend themselves against unfairness. Lack of Fear would cause a somewhat similar effect to leprosy - the purpose of fear is to tell you when to get out of a dangerous situation, so without it, the Newfoals wouldn't be able to keep themselves safe. And the entire point of ''WesternAnimation/InsideOut'' is that Sadness has a role too - it aids in empathizing with others, and it's how one signals that he/she needs help. Without it, one would have a LackOfEmpathy and no way to tell others that they have problems. What's happening to the newfoals isn't 'being uplifted to a happier state of existence', it's ''severe emotional lobotomy'' that should leave them ''completely unable to function'' in the world.
* Newfoals are often left as unable to feel anger, which would make them {{Extreme Doormat}}s. So what happens when they try to raise children? PushoverParents wouldn't even ''begin'' to describe it.
** ''FanFic/TheConversionBureauConquerTheStars'' shows the consequences of this. It's part of the character Firebird's FreudianExcuse: Her Newfoal parents just couldn't deal with her naturally fiery personality and couldn't accept her cutie mark (crossed swords over a shield, which she got defending another kid from being bullied).
** On the other hand, ''Fanfic/TheNegotiationsVerse'' makes it a moot point due to a flaw in the potion [[SterilityPlague making all the Newfoals sterile]], and seemingly even removing the urge to mate from them, if [[OriginalCharacter Halberd Wings]]' account in ''Warfare'' is anything to go by. But at the same time, that brings about an entirely new sort of horror. While it was [[EveryoneHasStandards a legitimate flaw that Celestia did state she would have fixed had she managed to convert all humans]], the truth of the matter is that if she failed, conversion of all humans would still have effectively been genocide, just through a slower route than outright annihilation. And on a related and also disturbing front, it's shown that despite them seemingly having no urge to mate, the Newfoals' inability to refuse anything born ponies ask of them extends to them being unable to deny requests for sex, which is its own brand of horror.
* Related to the question about what happens to Earth if Equestria just popped up in the middle of the ocean, here's something else to consider - without Celestia and Luna around to raise and lower the sun and moon, what happens to the rest of the world and the other species living alongside the ponies? ''Fanfic/TheNegotiationsVerse'' may not show it, but it does not mince words as to just how ''[[AscendedFridgeHorror horrifying]]'' the [[ApocalypseHow potential consequences]] would be.

!!FridgeBrilliance
* Celestia is dramatically more powerful and has a different personality than her canon self. If the GodsNeedPrayerBadly trope is in effect for the Conversion Bureau universe, this actually makes sense: Celestia multiplied her number of followers several times over in just a couple short years, so she's riding high on an ENORMOUS power boost.
** Well, to be fair, part of this is because the majority of TCB stories were written around the first season and earlier parts of the second season where we've never seen Celestia's limits (and well before [[WordOfGod Lauren Faust herself said]] that, as far as she was concerned, Celestia and Luna aren't goddesses). A minor number of fics later on noted this and some have changed the barrier into a spatial anomaly in order to nerf her.
* It's been noted that, since ponification changes one's mind, body, and soul, the resultant pony should rightly be considered a new being that simply possesses the memories of the original human. What nobody's ever considered is that the ponies have promised as much in the style of "[[Series/TheTwilightZone1959 To Serve Man]]". When they say that ponification "makes you a better person", they refer to the fact that the conversion process takes a human and uses their physical matter to ''literally make a better person''.