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In The Thousand-Year Blood War arc, Mayuri killed 28,000 Rukongai citizens in
order to balance the soul count. According to him, this was done because there
were a lot of Hollows disappearing, causing an overflow of souls in the Human
World. If Mayuri 'killed' souls in Soul Society, wouldn't they reincarnate in
the Human World, causing even more soul overflow?


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bleach
Why did Mayuri kill 28,000 Rukongai citizens?


Not exactly.

The way the balance works is thus:

  * A human soul existing in the Human World does so either through the birth or death of a human.
  * This soul can either be purified and transferred to Soul Society by a Soul Reaper, or transform into a Hollow either through worldly attachments or possessions, or if a Soul Reaper doesn't get to them quickly enough.
  * Soul Reapers can purify the transformed Hollows which allows their soul to re-enter the cycle.
  * Souls that exist on the other side in Soul Society can _eventually_ re-enter the cycle.

Ultimately, the objective is to maintain net-zero - there are enough souls
that are either Plus, in Soul Society, or are Hollow - but none should be
_taken_ from the cycle.

The way that a Quincy destroys a Hollow would prevent their soul from ever re-
entering the cycle, thus the balance becomes lopsided. If the Quincies
destroyed 28,000 Hollow, then there would be a surplus of 28,000 souls in Soul
Society. Thus, to maintain the balance, those 28,000 souls would have* to be
destroyed; they can't reincarnate since that would preserve the imbalance.

*: Although this does raise the question, why not allow half to reincarnate immediately, but...Mayuri's methods are pretty blunt and direct. The thought may have never occurred to him. Plus, there's no directly stated method that a Soul Reaper can cause a soul to immediately reappear in the Human World.


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For future readers who might have the same question but cant find the answer
here:

Quincies kills hollows. They dont purify hollows like Shinigamis do. When a
hollow get purified, their soul will be either send to SS or Hell depending on
what they have done when they were still alive and after x amount of years,
they will be reincarnated back to the world of the living(Hell unknown at the
moment).

Quincies prevents that, aka the souls will never be reincarnated as a living
person anymore. This ruins the balance betweent the world of the living and
the world of the spirit. There will be more souls than living beings since
spirits ages slower and every day SS gets filled with new souls from deceased
humans or purified hollows.

This is why Mayuri killed 28k rukongai citizens, to force them to reincarnate
back into the world of the living to maintain this balance.


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